[1] Gassert graduated in 1957 from Rancocas Valley Regional High School in Mount Holly, New Jersey.

[2] He played college football at the University of Virginia, where he was a defensive end.

In 1966, Gassert finished his career with the Philadelphia Bulldogs of the Continental Football League, helping to lead the team to the 1966 CFL Championship.

After working for thirty years as a banker, Gassert and his wife began a business building furniture that they sold at craft shows.

A resident of Medford, New Jersey, Gassert served on the board of education of the Lenape Regional High School District.