Mark "Vinnie" Dombroski is an American musician, best known as the lead vocalist and main songwriter for the American rock band Sponge. He also fronted the short-lived supergroup Spys4Darwin, and has been a member of several Detroit-based bands throughout his career.

Sponge is an American rock band formed in Detroit, Michigan, in 1992 by vocalist Vinnie Dombroski, guitarist Mike Cross, bassist Tim Cross, drummer Jimmy Paluzzi, and guitarist Joey Mazzola. Dombroski and the Cross brothers were previously in the hard rock band Loudhouse, with Mazzola joining later before the end of the band's tenure. Sponge's discography includes nine studio albums, four live albums, and several charting singles. They are best known for their 1994 hit "Plowed", their 1995 hit "Molly ", and their 1996 hit "Wax Ecstatic ".