Before Breaking Benjamin, Aaron Fink and bandmate Mark James Klepaski (bass), were members of the band Lifer (Strangers With Candy). They broke away from Lifer in late 2001, in a surprising blind leap of faith to join their old high school friend Ben Burnley (vocals/guitar) and Jeremy Hummel (former drummer) in creating Breaking Benjamin. Fink has helped Burnley write many of the bands lyrics and is a strong backbone of the band. He is known is an expressive guitarist with a flair for both color and crunch. Ben has stated the following about Aaron's work on the band's second album, We Are Not Alone, "He's not so much a riff guy as someone who creates atmosphere. His talents really shine through here."

In live performances, Fink currently plays his own custom model Washburn Idol guitar. It is based on the Idol series, fitted with a single humbucking pickup in the bridge position. He also plays some guitars from PRS Guitars.

Fink is living in Pennsylvania and had a son born in 2002 named Gavin.