Pat Quinn and the late Pete Frates, another man diagnosed with ALS, started the challenge to raise money for research and awareness.
The health care workers beat out other groups of selfless people for the prestigious honor.
Thousands of people hit the pavement in downtown Los Angeles on Sunday for the annual Walk to Defeat ALS.
Renee Zellweger was on-hand as part of Team Nanci, in honor of Nanci Ryder, at the annual Walk to Defeat ALS on Sunday.
Reese Witherspoon was on-hand as part of Team Nanci, in honor of Nanci Ryder, at the annual Walk to Defeat ALS on Sunday.
A group of people who know something about close calls with icy water are the latest to take the 'Ice Bucket Challenge.'