As a member of the US Rowing National Team from 2001-2004 he placed second at the 2003 Pan American Trials in double sculls and had an outstanding 2002 that saw him claim a gold medal in Senior 8 and a silver medal in the Elite Double at the US Nationals. He was also a silver medalist in 2001 in the Nations Cup (now the U23 World Championships) 8 in Ottenshiem, Austria. In 2006, he took silver at the Masters Nationals Open Single Event. He was a gold medalist in 2007 at the first ever Concept 2 Team Indoor Rowing challenge, held in Essen, Germany. In 2008, 2009, and 2012 Jack competed in 3 International Full Ironman competitions in Nice, France, Florianopolis, Brazil and Cozumel, Mexico.