Jim Dreyer (born August 16, 1963 in Grand Rapids, Michigan), also known as 'The Shark', is an ultra marathon athlete, because his swimming accomplishments are often tied to extensive running and cycling feats. He has swum across various lakes, among others: Lake Michigan , in 1998 Lake Huron in 1999 Lake Erie , as part of a duathlon in 2000 Lake Ontario , as part of an "Ironman-distance plus" triathlon, in 2000 Lake Michigan full length, est. , in 2003 Lake Superior , in 2005 Dreyer has set various records on those distances and has won multiple marathon and triathlon awards. His swimming accomplishments have all been achieved with a wetsuit, and some swims have been done unaccompanied. These facts cause some dispute for establishing world marathon swimming records, as FINA, Channel swimming, and other marathon swimming rules do not allow unaccompanied or wetsuit swims to compete with standard swim records () On August 28, 2006, Dreyer began an attempt to set a record for the longest continuous swim in the open sea. Dreyer plans to make an estimated 31 crossings totalling of the Straits of Mackinac. Dubbed "Dire Straits 125", the feat is estimated to take 84 to 96 hours. Through his swimming projects he tries to raise funds and awareness for the Big Brothers Big Sisters of America. Jim is now living in Batesville, IN and successfully selling real estate. 1963 births Living people American male triathletes American long-distance swimmers American male swimmers