SCHENECTADY, N.Y. -- When Dr. John Fildes looks back on his time at Union College, a lot of his memories are from Achilles Rink. For the first time in a decade, Fildes returned to campus, not to root for the Dutchmen, but to talk to students about his career.

Fildes graduated from Union College in 1977 with a degree in bioengineering.

He currently works as the director of Las Vegas University Medical Center's trauma unit and was there for the moments and days that followed October's mass shooting, the deadliest in modern U.S. history.

"The shooting started, I think at about 10:08, and by about 10:15, I got called. They said 'there's been a mass shooting,' " said Fildes. "As I got in, there's 35 people with gunshot wounds laying on gurneys. I went around with the nursing supervisor and examined each one, decided who needed to go directly to the O.R., who could be worked up."

Fifty-eight people were killed and hundreds more were wounded as a result of the shooting.