Most of the music Rzeznik listened to while growing up was influenced by his sisters, and consisted of classic rock such as The Rolling Stones and The Kinks.The youngest of his four older sisters moved towards punk music and Rzeznik became interested in bands such as the Ramones and The Clash.It was during this period and while attending Mc Kinley Vocational High School that Rzeznik began playing the guitar.Rzeznik briefly attended Buffalo State College, dropping out after his first year.
This performance was captured on DVD and CD for the public in the Goo Goo Dolls release Live in Buffalo: July 4, 2004.
Rzeznik met former model Laurie Farinacci in 1990, married her in 1993 but got a divorce in 2003; they did not have any children.
They got the name Goo Goo Dolls from an ad in a True Detective magazine when a concert promoter asked them.
and Australian Idol judge and marketing manager Ian "Dicko" Dickson on the Fox network's The Next Great American Band.
On April 18, 2015, he participated in the Toyota Celebrity/Pro Race where he finished 12th to actor and former two-time winner of the event Alfonso Ribeiro for which he donated ,000 to charity.
In the early days of The Goo Goo Dolls, the band performed at gigs relentlessly, with Robby as the frontman (Rzeznik gradually becoming the frontman over the next few albums, as each new album contained more songs sung by Rzeznik than the last).