Leif is best known for his villainous role in "The Amazing Spider-Man." He was born in Tampa, Florida but grew up in Clear Lake, South Dakota. He graduated from Doane College in Crete, Nebraska and worked in both Champaign, Illinois and St. Louis, Missouri before moving to Los Angeles to pursue an acting career. Leif was nominated for Best Actor in a Feature Film at Method Fest for his performance in "Lunatics, Lovers and Poets." He writes, performs, teaches and directs sketch comedy at ACME Comedy Theatre in Hollywood, where they produce an on-line sketch comedy show called "Hollywood Saturday Night." He is married to Amy Gantvoort and they have a daughter named Gabrielle (Gaby), who works on the award winning web series "The Guild."

Leif is a member of MENSA.Leif generally does all of his own stunts.