He is one of the first members of Night Train Swimmers who crossed the English Channel in 2008. His other notable open water swims include touching the buoy at the Farallon Islands to complete the Farallon Islands relay swim in 2011 and winning the Mayors Cup at RCP Tiburon Mile.
Holscher was a member of the Night Train Swimmers]s successful relay team that swam 26.4 nautical miles from the Golden Gate Bridge to the Farallon Islands on 20 May 2011 in 14 hours 45 minutes together with Darrin Connolly, Vito Bialla, John Mathews, and Kim Chambers.
SF to SB Relay
Holscher was also a member of the Night Train Swimmers's attempted SF to SB Relay between 23-28 September 2012, the world's longest non-stop ocean relay swim attempt (339 miles or 545.4km) together with Patti Bauernfeind, Joe Locke, Kim Chambers, Zack Jirkovsky, and crew Vito Bialla and Patrick Horn. It was halted after 6 days due to bloom after bloom of venomous jellyfish.
California Coastal Swim
Holscher will participate in the Night Train Swimmers's attempt to set the world record for the longest non-stop ocean relay swim in history with its planned 228-mile (367 km) attempt to swim down the California coast from Point Conception to Coronado in August 2013. Under the direction of captain Vito Bialla, its relay members include Phil Cutti, David Holscher, Zach Jirkovsky, Luane Rowe, Blair Cannon, and Grace van der Byl.