OUR LEADERS
Michael Mabry
Partner and Co-Founder
John Rothenberger
Partner and Co-Founder
Kip Turner
VP- Richmond/Charlottesville
Chazz Woodson
VP- Hampton Roads/Richmond
Casey O'Neill
Partner
Alec Wortman
Sr. Director
Patrick Tracy
VP- Annapolis/Baltimore
Trevor Tierney
VP- Student-Athlete Development Director
Andrew Stimmel
Partner
Mark Mickum
Sr. Director
Dr. Abby Latona
Sr. Director
Eric Seremet
VP- New Jersey
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Michael Mabry
Partner and Co-founder
Michael Mabry is A Partner and Co-Founder of One Play Development, where he leads the organization’s mission to positively impact youth sports. A passionate advocate for holistic athlete development, Michael is committed to empowering athletes to thrive mentally, physically, and emotionally both on and off the field.
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2x Team Captain at Christopher Newport University
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All-State & All-Conference Defenseman
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Champion All-American Game selection (HS)
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Co-Founder of One Play Development (2022)
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Certified EXOS Performance Specialist, Precision Nutrition Coach, and Mental Performance Mastery Coach
As a coach, Michael has held leadership positions in various top high school programs, specializing in player development, team culture, and mental performance. His certifications and experience as a trainer have allowed him to guide athletes through the mental and physical demands of high-level competition. Since co-founding One Play Development, Michael has directly impacted over 4,000 student-athletes, teaching them how to embody confidence, handle challenges, and positively impact others. His leadership in One Play Development continues to influence athletes, club team and high school programs across the country, helping athletes build confidence, overcome challenges, reach their highest potential and directly guide and influence teams toward developing winning records with winning cultures.
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"Teach the student to teach themselves”
Casey O'Neill
Partner
Coach Casey O'Neill combines a storied coaching career with visionary leadership as a Partner at One Play Development, a role he has held since 2021. With 25 years of lacrosse coaching experience—including 14 as Head Coach at Gonzaga College High School—O'Neill's teams achieved:
211-54 career head coaching record | 123-12 WCAC coaching record
9 WCAC Championships | 4× WCAC Coach of the Year
4× Top 3 national finishes (9× Top 25) | 5× Washington Post #1 rankings
15 US Lacrosse All-Americans | 16 All-Met 1st Team selections
2010 All-Met & US Lacrosse (Potomac Chapter) Coach of the Year
His accolades include Washington Post All-Met honors and mentorship of 130+ collegiate players, including 20 who served as college captains. O'Neill's leadership and athlete-first philosophy blend technical mastery with mental performance training.
As Assistant Athletic Director for 14 years, O'Neill oversaw 17 sports and hundreds of coaches, helping elevate programs and student-athletes. A Lehigh University alumnus and recipient of its prestigious "Coach's Award," his NCAA and H.S. lacrosse playing career informs his approach to developing resilient, high-performing athletes and teams.
At One Play Development, O'Neill drives 1v1 development, team building and culture strategy, staff mentorship, while his Mental Performance Mastery Program equips athletes with tools for on-field success and lifelong resilience. His dedication solidifies One Play’s reputation as the nation’s premier lacrosse institution.
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"It is amazing what can be accomplished when no one cares who gets credit"
Andrew Stimmel
Partner
Andrew Stimmel brings unparalleled leadership and expertise as a Partner at One Play Development, following a distinguished career in NCAA and international lacrosse.
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Captain & Defensive MVP at Ohio State
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Youngest NCAA Head Coach with landmark victories at Marquette
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Team USA Gold Medalist (U-21 Defensive Coordinator)
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Led Yale as offensive coordinator to multiple Ivy League championships and National Championship in 2018
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Developed over 30 collegiate All-Americans and developed 23 PLL, MLL & NLL Draft Picks
A former Captain and Defensive MVP at Ohio State, Stimmel transitioned his on-field success into a prolific coaching career becoming one of the youngest NCAA Head Coaches ever. As the offensive coordinator he achieved national recognition by leading Yale to its first-ever National Championship in 2018, followed by a runner-up finish in 2019. His offenses rank among the most prolific in NCAA history.
Stimmel also served as the Defensive Coordinator at Marquette University, helping the program secure its first-ever Big East Championship in 2016. A proven mentor and innovator, Stimmel’s leadership continues to empower athletes to excel on and off the field. His ability to prepare athletes, their families, as well as club and H.S teams to understand what it takes to go to the next level is a good as can be found. His commitment to winning with integrity drives his approach.
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“A good coach can change a game. A great coach can change a life”
Alec Wortman
Sr. Director
​As a Senior Director of Mental Performance at One Play Development, Alec brings over a decade of experience supporting athletes at every level—from youth and high school to NCAA and international competition at the World Lacrosse Championship.
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Former Division I pole vaulter & team captain (University of Maine)
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Master's in Sport & Performance Psychology (National University)
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Key member of One Play Development since 2022
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Specializes in mental strength coaching and athlete mentorship
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Leader in mental performance delivery and program accessibility
Alec combines firsthand athletic experience with advanced education in mindset, neuroscience, and human performance. His work spans individual, team, and organizational levels, creating high-impact programs for athletes, coaches, and teams.
Alec's mental strength coaching focuses not only on tailored mental skills training but also on guiding athletes through the pressures of competition, identity, and personal growth. He leads programs that foster confidence, focus, and resilience, both in-person and online, using science-backed strategies to help athletes unlock their potential.
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"You can't stop the waves, but you can learn to surf"
Mark “Mugs” Mickum
Sr. Director
Mark “Mugs” Mickum is a nationally respected lacrosse goalie specialist with over 30 years of coaching experience in the Washington, D.C. metropolitan area. A former High School All-American at The Landon School and graduate of Washington College, Mickum has dedicated his career to training elite goalies at both the high school and collegiate levels. His coaching accomplishments include:
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30+ years of goalie coaching experience
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10+ High School & College All-Americans developed
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20+ All-State, All-Met, and All-League selections
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3× Markland Kelly Award winners coached
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1 All-Metropolitan Player of the Year
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2 High School National Championships
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30+ Division I goalies mentored | Numerous standout Division III players
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12+ years as Goalie Coach at Georgetown Preparatory School
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Contributor to 15 IAC Championships
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Coaching roles with multiple high school and club programs across the region
Mickum’s goalies have gone on to compete at some of the nation's top academic and athletic institutions, including:
University of Notre Dame, University of Maryland, Syracuse, Harvard, Yale, Penn, Virginia, Johns Hopkins, Navy, Michigan, Villanova, Boston University, Bucknell, Vermont, Colgate, and more.
His decades-long commitment to excellence continues to shape the next generation of top-tier lacrosse goaltenders across the country.
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"People who are really successful in life, make the boring and tedious into an art form “
Kip Turner
Vice President - Richmond/Charlottesville
Kip Turner is one of the most respected minds in lacrosse. He is widely regarded as one of the nation’s top coaches at the goalie and faceoff positions, having developed elite talent such as Alex Rode, Matthew Nunes, and Petey LaSalla—who became an NCAA record-holder and PLL Draft Pick under his guidance. Turner brings elite-level experience and tactical mastery as a coach, mentor, and former professional standout, helping to redefine goalie, faceoff, and transition play at the highest levels of collegiate lacrosse.
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2× NCAA Champion as UVA Assistant Coach (2019, 2021)
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NCAA Champion, Defensive MVP & Starting Goalie – Virginia (2006)
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Mentored NCAA all-time leader in faceoffs taken and UVA’s all-time leader in faceoff wins & ground balls (Petey LaSalla)
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Coached multiple All-Americans including Alex Rode & Matthew Nunes
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Guided UVA to NCAA-best ground ball stats for 7 straight seasons
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MLL Champion, MLL Goalkeeper of the Year, and former No. 2 overall MLL Draft Pick
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3× MLL Defensive Player of the Week
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A 2007 graduate of the University of Virginia, Turner has played a pivotal role in UVA’s resurgence as a national powerhouse under head coach Lars Tiffany. As the Cavaliers’ goalie and faceoff coach, transition coordinator, and contributor to offensive development, he’s been instrumental in seven consecutive winning seasons, multiple Final Four appearances, and two national titles.
As a player, Turner was a USILA All-American and the Defensive MVP on Virginia’s undefeated 2006 national championship team. He then enjoyed a decorated nine-year MLL career, winning two league titles with the Chesapeake Bayhawks, one with the Boston Cannons, and earning MLL Goalkeeper of the Year honors.
With six championship rings—one as a player at UVA, two as a UVA coach, two MLL titles with Chesapeake, and one with Boston—Turner’s legacy continues to grow. Off the field, his leadership, player development, and tactical insight have been key to his ongoing success.
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"Performance equals potential minus interference; it’s our job to maximize potential and minimize interference so that performance is optimal."
Patrick Tracy
Vice President - Annapolis/Baltimore
Coach Tracy is a veteran collegiate coach and trusted mentor, bringing over two decades of high-level experience to One Play Development. A proven developer of talent, Tracy has dedicated his career to guiding athletes toward success in all aspects of their lives—on the field, in the classroom, and beyond.
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Played collegiately at Ohio State and Goucher College•
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Captain, Offensive MVP, and All-Conference attackman
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21 years of coaching experience (Goucher College, Dartmouth College, UMBC, High Point University, Washington College)
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Developed over 20 college All-Americans and 18 professional lacrosse players (NLL, MLL, PLL)
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Developed 4 conference Rookies of the Year and 5 conference Players of the Year honorees; coached and mentored 2 All-Pro PLL players and 1 PLL Rookie of the Year
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Offensive Coordinator at High Point University, where they won multiple Southern Conference championships and an Atlantic Sun Championship. Defensive Coordinator at UMBC, where they won multiple America East championships. As both an offensive and defensive coordinator at the college level, his units ranked among the nation’s best.
A longtime coach and mentor, Tracy has made a career out of developing and mentoring athletes to be successful in all facets of their lives. His knowledge of the game is outstanding, and his ability to coach and get the most out of his players both on and off the field is truly elite. He brings the perfect blend of lacrosse IQ, accountability, cutting-edge teaching, and non-negotiable fundamentals to his work with young athletes. He believes that working hard and doing things the right way consistently will always lead to success.
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"The principle is competing against yourself. It's about self-improvement, about being better than you were the day before."
Dr. Abby Latona
Sr. Director
Dr. Abby Latona brings over 12 years of elite coaching experience to One Play Development, with a proven track record of success at the youth, high school, and club levels in girls lacrosse.
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3× WPIAL Champion Head Coach – Mars Area High School (PA)
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2025 WPIAL 2A Coach of the Year
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2024 USA Lacrosse Western PA Coach of the Year
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Co-Owner & Director – Steel City Lacrosse Club (PA)
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2023 Western Pennsylvania Positive Athlete Most Positive Coach
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Former NCAA DIII Captain & All-ODAC Selection – Shenandoah University
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As Head Coach at Mars Area High School, Latona has built one of Western Pennsylvania’s top girls lacrosse programs, capturing three consecutive WPIAL titles, three section championships, and four state appearances. Her leadership has produced 15+ NCAA commits, USA All-Americans, and countless young women who have advanced in both athletics and academics under her mentorship.
Her coaching style emphasizes leadership, discipline, positivity, and resilience—earning her regional and national recognition for both competitive success and player development. Driven to grow Pittsburgh lacrosse, Latona co-directs Steel City Lacrosse Club, one of the region’s top girls club programs, and has also coached for Xtreme Club Lacrosse in Lancaster, PA. A two-time captain and standout attacker at Shenandoah University, Latona was recognized for her athletic and academic achievements.
This background shapes her focus on individualized skill development and cultivating a championship mindset both on and off the field.
Holding a Doctorate in Occupational Therapy, Latona’s clinical expertise includes a focus on mental wellness for female student-athletes. She has been a practicing Pediatric OT for six years. With a focus on long-term development, Abby is dedicated to growing the game of girls lacrosse and helping young women foster a lifelong love for the sport. Her passion lies in empowering girls to thrive—not only on the field, but in life.
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“When we help girls thrive, we all win.” — Women’s Sports Foundation (2024)
Chazz Woodson
Vice President - Hampton Roads/ Richmond
Chazz Woodson is a standout figure in the world of lacrosse and joins One Play Development after leading the nation's first and only [DI men's] HBCU lacrosse program through its foundational phase. Chazz's professional playing career spanned 13 seasons. Regarded as one of the sport's most electrifying players, the two-time MLL All-Star was known for his acrobatic style of play, that
landed him on ESPN's Sports Center Top 10 list multiple times.
Prior to being drafted into Major League Lacrosse, Woodson was a standout at Brown University. In both his junior and senior campaigns, he earned:
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All-Ivy League, All-New England, and the team's Offensive MVP honors.
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For his efforts, he was also recognized as a member of the 2000-2009 Brown University Lacrosse All-Decade Team.
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Career mentor, educator, and coach with over 20 years of experience developing athletes and young people off the field
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Served on the USA Lacrosse Board of Directors, founding member and coaching director for Nation United Lacrosse, and mentor with Big Brothers Big Sisters of Miami (FL)
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Coached multiple sports at youth, middle, and high school levels; taught in public and independent schools
Chazz spearheads One Play Development's Hampton Roads office. He grew up in Norfolk, Virginia, and is a former three-sport student-athlete at Norfolk Academy and Blue Ridge School.
He holds a bachelor's degree in Education Studies with a focus in Human Development and a master's degree in Coaching and Athletic Administration.
“I owe a debt of gratitude to everybody who has poured into me throughout my life. The only way I know how to pay that debt off is to pay it forward. That’s my goal each day.”
Trevor Tierney
VP/Student-Athlete Development Director
Trevor Tierney, a former champion coach and player at every level, brings extensive experience in athletics and education in psychology, leadership, and character development to his work with athletes and organizations.
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First goalie in lacrosse history to win NCAA, professional, and international championships
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Two-time NCAA DI National Champion & All-American at Princeton University
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Two-time Team USA Player, winning ILF Championship and All-World Goalie in 2002
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MLL World Champion with the Baltimore Bayhawks in 2005 and 5x MLL All-Star
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Defensive Coordinator & Goalie Coach at University of Denver, winning 2015 NCAA DI National Championship
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Master’s in Psychology from Harvard Extension School with a focus on Adult Development
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Certified Excellence With Integrity Specialist
A former two-time NCAA Champion and 2001 USILA Goalie of the Year at Princeton, Tierney went on to become one of the most decorated goalies in international and professional lacrosse. He earned All-World honors with Team USA, captured an MLL Championship, and was selected to five league All-Star games.
Transitioning from elite player to coach, Tierney helped guide the University of Denver to three NCAA Final Fours and the program’s first-ever National Championship in 2015. His defensive leadership and goalie development have shaped some of the game’s top collegiate and professional athletes.
Beyond the field, Tierney holds advanced training in psychology and leadership development, with psychology degrees from Princeton and Harvard Extension School, and is certified as an Excellence With Integrity Institute Specialist. His unique blend of championship-level athletic experience and developmental expertise equips him to mentor athletes, teams, and organizations in pursuit of excellence.
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"My mission is to help student-athletes achieve excellence through lacrosse while finding fulfillment and success both on and off the field."
Eric Seremet
VP - New Jersey
Eric Seremet, recognized for a distinguished career spanning over 25 years as a Division I lacrosse coach and professional player, brings his wealth of expertise to One Play Development. Seremet’s coaching career includes first-ever program accomplishments, such as conference championships, NCAA tournament appearances and victories, and professional draftees.
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2014 IMLCA/NCAA Division I Coach of the Year
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2022 IMLCA/NCAA Division I Assistant Coach of the Year
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2x Conference Coach of the Year (ECAC 2014 / SoCon 2016)
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3x Conference Champion / 3x NCAA tournament appearances at Air Force, including the program’s first NCAA tournament win
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2021 NCAA tournament appearance at Rutgers, first since 2004, first win since 1990
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2022 NCAA Final Four appearance with Rutgers, program record 15 wins
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1991 National Champion as a player at the University of North Carolina, competing in 4 Final Fours and winning 4 ACC championships
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8-year professional career in the NLL
Under his leadership, 17 players earned All-America honors, 79 earned All-Conference, and 16 were drafted professionally. He mentored the USILA top midfielder and current PLL player Shane Knobloch in 2024. Off the field, 28 student-athletes earned Scholar All-America honors and 153 earned academic All-Conference recognition.
A 7-time finisher of the Leadville Trail 100 run, Seremet channels his extensive background into a simple mission: helping players unlock their full potential and break through barriers. Through One Play Development, he continues his lifelong commitment to the sport by preparing the next generation of lacrosse players to compete with confidence, creativity, and discipline.
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“You’re better than you think you are, you can do more than you think you can.”
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John Rothenberger
Partner and Co-founder
John is a co-founder of One Play Development and the day to day managing business partner. A multi-time successful entrepreneur , John's involvement in the business and One Play's partnership with Volition Partners, a proven startup and early-stage investor, assures viability and long-term success. His commitment to the proper development of athletes, coaches and entrepreneurs brings a unique perspective to the market of youth sports.
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"Your attitude, sportsmanship and team spirit will always make you a winner"