ABOUT HEAL
Helping Elevate All Levels (HEAL) Swim Club strives to be among the Nation's most successful competitive swim programs that produce nationally ranked competitors and NCAA scholar athletes.
The Coaches
CROSBY TREADWELL - HEAD COACH/OWNER
Crosby learned how to swim at the age of three. His learn-to-swim journey began at the East Capital Natatorium, in Washington, D.C. At the age of eight he joined the competitive swimming team which represented the District of Columbia (DCDR). Crosby swam competitively from the age of 8-18. During this time he represented the nations capital as a member of the youth games and zones team(s). Mr. Treadwell was also a four year swimmer in high school (Oxon Hill High School) and received All County recognition his junior and senior years, as well as All Met recognition his Senior year. After attending Drexel University Crosby returned home to pursue his passion as a coach. Mr. Treadwell has been a competitive swimming coach since 2004. He has been the Head Coach of TPDC Allstars for the past five years and is entering his fourth season as Head Coach at Maret High School.
TARAH MASSEY (COACH T) - ASSISTANT COACH
Coach T. is a native Washingtonian and a graduate of Howard University. Coach T. possesses a wide range of aquatic experience, from competitive swimming to aquatic rehabilitative training. Her swim journey began in 1992 at YWCA Aquatic Program
in Northwest, DC. While participating at the YWCA, she was introduced to water polo. Coach T. swam for the Metro Marlins swim team, representing the Metro Marlins swim team, Theresa Banks Swim Club-Tiger Sharks (TBSC), and her high school team. Coach T has been affiliated with the Prince George's Sports and Learning Complex, Theresa Banks Memorial Aquatics Centers, and DPR Aquatics. When she's not coaching swimming, she teaches one-on-one swim instruction and deep & shallow-water training. Although her swim journey is unconventional. Coach T.'s experience is indispensable. Allowing her to connect and relate to her swimmers both, inside and outside the pool. Coach T. wants her swimmers to understand that
PROGRESSION IS OUR AIM, NOT PERFECTION!
Fun Fact: Breaststroke is Coach T’s favorite stroke is
Joined HEAL Swim fall 2024
COACH OSEI - ASSISTANT COACH
Coach Osei began swimming at the age of five, getting his start with what was then known as DCRP at Wilson and Marie Reed. He went on to train year-round with several competitive swim clubs, specializing in the 200 IM
After years of privately coaching and developing his own children in the sport, Coach Osei expanded into club coaching, joining HEAL Swim Club as an assistant coach in 2025.
His coaching philosophy emphasizes strong technique, continuous improvement, athlete development, and motivating swimmers to become the best versions of themselves both in and out of the pool.
One of Coach Osei’s greatest strengths is the unique perspective he gained from spending time away from the sport he dedicated much of his early life to. Returning to swimming as a coach has given him an appreciation for both the traditions of competitive swimming and the evolution of modern training. He actively studies contemporary approaches to technique, strength and conditioning, athlete development, and coaching philosophy, while remaining grounded in the fundamentals that have long defined the sport.
Coach Osei’s goal is to combine experience, curiosity, and a lifelong connection to swimming to help athletes develop confidence, discipline,
sound technique, and a genuine desire to improve
COACH ERSIN - ASSISTANT COACH
Ersin brings a lifelong background in competitive swimming and endurance sports to the pool deck. He swam competitively throughout high school, competing at Sectionals, Futures, and the METROS DC championship, before continuing his swimming career briefly at Purdue University. He then transitioned into triathlon, completing several Olympic-distance races and finishing the IRONMAN 70.3 in Atlantic City. He is currently training for the IRONMAN 70.3 Belgrade later this year.
On the coaching side, Ersin has spent the past three years as an assistant coach with HEAL, and has also coached summer league swimming for three seasons across PGP and TPDC. He is passionate about developing strong technique, building endurance, and helping swimmers of all levels compete with confidence
