Meet our Coaches

Stefan A. Koch - Boy'S Head COACH

Stefan learned how to row at JEB Stuart HS and the University of Pennsylvania. He’s enjoyed coaching in Fairfax, Seattle, and Baltimore. Stefan began coaching at George Mason University, then spent 6 years as the Varsity Girl’s Coach at Robinson Secondary School.  The team won the Girl’s 2nd 8 event at Stotesbury in 2002 and a Virginia state title in 2005 and numerous other States medals in those years. Following Robinson, Stefan moved to Seattle, living there for 5 years. He taught high school history in Sammamish, WA and coached for Mount Baker Crew. He took multiple crews to USRowing Youth Nationals, placing as high as 5th in the Boy’s Varsity 8. In 2010, Stefan took over as the Novice Men’s & Women’s coach at Loyola University Maryland. He served in that role for 3 years, during which Loyola’s Ltwt Women’s 4 placed 4th at the IRA National Championship

Stefan became Varsity Boys Coach at Oakton H.S. in November 2013 and also coaches in the Summer & Fall for Resilient Rowing Club and coaches a USRowing Junior Development Camp. The Oakton Boys team won gold in the Pair at the 2016 NSRA Nationals. In 2017 the Oakton Boy’s 2nd 8 won Silver at Virginia States and the Lightweight 4 won Gold. The Varsity Boy’s team has doubled in size in his time at Oakton. Stefan is certified by USRowing as a Level III coach, and also works as a substitute teacher for Fairfax County Schools.

Russell Topp - men's Freshman coach

Russell Topp has been coxing competitively for over 10 years, first at James Madison High School, then George Mason, New York Athletic Club, and currently at Potomac Boat Club. Over the past 11 years he has acquired an impressive stack of over 50 medals, including 3 National Championship wins. No one on the team has ever met a better, more amiable coxswain than Russell Topp. He has been Coaching the novices at Oakton for 5 years, during which time he has also been the official Oakton Crew Bus Driver. In his spare time, Russell is a competitive fox breeder, he has spent the last 7 years attempting to breed a fox that can whistle the national anthem.

Christine LaRoche - Women's Freshman COach


Christine is from Fairfax, VA. She graduated from William & Mary in May of 2015. Now, She works as a Systems Developer for Carfax.  She has 8 years of rowing experience - the first 4 of which were at Fairfax High School followed by 4 years at William & Mary. In that time she has traveled anywhere from Augusta GA to Boston, MA to row. She's raced every seat in an 8.

Chris margopoulos - Men's Assistant coach

Chris' rowing career began at James River high school where he was elected team captain his senior year. He had success in the men’s novice 4+, 1x, 2x, and lightweight 4; the latter of which earned a bid to the SRAA National Regatta via a 3rd place finish at the Virginia State Championship. His rowing career continued at George Mason University where he was elected Treasurer, and later President of the Crew Club. Over the span of his 4 years at GMU, he was a member of a successful freshman/novice 4, 2nd varsity 8, lightweight 4, 1st varsity 8, and varsity 4x. Chris’ collegiate rowing career ended with a gold medal at the 2015 ACRA National Championship as stroke seat of Mason’s V4x, bringing home GMU’s 2nd national title. He continues to work towards a degree in systems engineering at Mason, and is excited to have the opportunity to coach high school rowing at Oakton. 

Daphne Martschenko - Women's assistant COACH

Daphne started rowing at Oakton in 2007 and went on to row for Stanford University where she was part of the NCAA Division I second place team in 2011, rowing in the second varsity 8 that secured a NCAA championship title in their event. Daphne was also part of the first Stanford women's rowing program to ever win a PAC12 Conference championship, competing in the first place varsity eight boat that helped secure the historic team win in 2014. Daphne is a two-time U23 national team member, competing for the USA in 2012 in the 4- and 2014 in the 4x. Currently a doctoral candidate at the University of Cambridge, Daphne has competed twice in the famous Oxford Cambridge Boat race (2015, 2016) and is excited to be able to help out Oakton Crew this year.  

JACK CONNORS - Women's Developmental Coach

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Jack rowed competitively for eight years, first for Robinson Secondary and then the University of Delaware's lightweight crew, leading the nationally renowned Delaware 3V his junior year. Jack is in his first year of coaching and is excited to see the Oakton women's team work hard and race hard, as well as develop confidence and ability to realize their goals. In real life, Jack works in the political sector and enjoys sport photography and hiking throughout Virginia. 

Mairin Haley - Women's Assistant Coach


Mairin was introduced to rowing in her freshman year at William & Mary. For seven semesters she competed as the top women's coxswain at races such as the Head of the Charles, SIRA, Head of the South, and ACRA. In her senior year Mairin was elected to be the varsity women's captain. She graduated from William & Mary in 2016 and is currently working as a medical scribe.

Dan Luongo - MEN'S Assistant COACH