Captain Tim Johnson
Captain Johnson made major contributions for the support elements in marathon swimming, including the development of unprecedented computer applications that modeled swims allowing analysis of currents and tides. He was one of the founders of the Manhattan Island Swimming Association and was the organization’s historian. His advice on current and tides set the standards and were partly responsible for the record swims around Manhattan Island.
Captain Johnson has also consulted on swims affected by tidal flow in various locations around the world and the construction of shark cages. He has authored the comprehensive and informative History of Open-Water Marathon Swimming, an authoritative book on marathon swimming.
Tim Johnson explains the physics of open water swimming at the 2010 Global Open Water Swimming Conference in New York City: