Jack, began his triathlon career in 2001, San Antonio, TX. At the end of his first season, he was 5th in the Region and 36th in the nation, for USAT, HM. All-American To date Jack has won the region 5 times, placed 2nd five times, 2nd overall Masters twice.. He has been USAT, All-American 14 straight years, placing in the top 10, 6 times, twice (2005, 2006) he was 50-54 national age group champion. In 2005 and 2006 he was grand master national champion in the sprint Nationals, in 2007 he was 2nd in the sprint nationals. Jack was 9th in the USAT sprint nationals in 2013 and 4th at the sprint world championships in Edmonton, Alberta, he was ranked 14th in his age group in 2014. Jack was first in 2010 in duathlon for his age group (55-59) SMW. All-American in duathlon 2007 3rd in USA (50-54) HM in 2008.