(December 10, 1849 – February 15, 1931) was the physician at Auburn State Prison in Auburn, New York under warden George W. Benham.

Gerin performed the autopsy on Leon Czolgosz.

[1] Gerin was born in Cobourg, Canada West in 1849 and attended Queen's University where he attained his M.D.

In 1913 he was charged with brutality and indifference to suffering.

[3] He died at his home in Auburn in 1931 and is buried at St. Joseph's Cemetery.