Tim Twietmeyer (born November 30, 1958) is an Auburn, California-based ultramarathon runner and an engineering manager at Hewlett Packard, in Roseville in the U.S. state of California.
Twietmeyer is also a mountain biker, road cyclist, and retired almost-scratch golfer and swimmer.
He is best known for his five victories and unprecedented 25 sub-24 hour finishes at the 100-mile (160 km) Western States Endurance Run.
[1] Twietmeyer is the only person to have completed the Western States Endurance Run more than 25 times in under 24 hours.
[5] Beyond his WS100 exploits, Twietmeyer has won the Eagle 100-mile (160 km) Run in Canada, and completed the Ultra-Trail du Mont-Blanc through France, Italy, and Switzerland.