Molnar served head football coach at the University of Massachusetts Amherst (UMass), for two seasons, from 2012 to 2013, compiling a record of 2–22.
Molnar began his coaching career at his alma mater Lock Haven University from 1984 to 1986, working with the wide receivers, tight ends, running backs and placekickers.
From 2007 to 2009, Molnar followed coach Brian Kelly to Cincinnati and continued to help develop record-breaking quarterbacks and wide receivers.
In 2010, his first year with the Irish, Molnar helped install a new offensive system and developed both Dayne Crist and Tommy Rees as first-time starting quarterbacks.
In 2011, Molnar helped the Irish earn a second straight bowl game bid thanks in part to the play of quarterback Tommy Rees.
As a unit, the Irish averaged 424.1 yards per game on offense thanks in part to Rees and 1,000-yard rusher Cierre Wood.
The 2012 season was the team's first as a member of the Mid-American Conference, and UMass' final transition year to NCAA Division I FBS play.
Molnar and his wife Meg have eight children: Charley III, Gillian, Tate, Bryce, Mitch, Gemma, Gianna and Dominic.