After graduating from San Marcos High School in 1998, Warkentin attended the University of Southern California, from which he graduated in 2003 with a degree in communication. While a Trojan, he was a four-time All-American. He was also awarded USC's Willis Award as a freshman.
He is the founder and head coach of the Santa Barbara Open Water Swim Camp held in Santa Barbara, California.
Warkentin qualified for the 2008 Summer Olympics in Beijing following his performance at the 2008 World Open Water Swimming Championships. In the lead-up to the Games he was noted by Time as one of its "100 Olympic Athletes To Watch."
He is a two-time national champion while representing the Santa Barbara Swim Club under Head Coach John Dussliere in the open water 25-kilometer, the longest sanctioned race in USA Swimming.
At the 2008 Beijing Olympics, Warkentin finished in eighth place with a time of 1:52:13.0, twenty-one seconds behind gold medalist Maarten van der Weijden. He also was just barely touched-out by Maarten van der Weijden for the gold medal in the 25 km 2008 World Open Water Swimming Championships in Sevilla, Spain. He was fourth in the 25 km race at the 2007 World Swimming Championships in Melbourne, Australia.
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