He has worked for the Milwaukee Jobs Initiative, the Milwaukee Community Service Corps, the Urban Economic Development Association of Wisconsin, and the Center for Democracy and Citizenship, and has been an aide to Wisconsin State Senator Bob Jauch and Congressman David R.

[2] In 2009, Zepnick proposed a bill to require sobriety of bartenders and limit "all-you-can-drink" specials.

[3] In 2015, Zepnick admitted to drunk driving after he was arrested for a traffic violation in Greenfield, Wisconsin.

[5] Zepnick ran for re-election in 2018 but was defeated in the Democratic primary by Marisabel Cabrera.

A challenge to the election results would have cost about $5,000, and Zepnick (who said he'd been sober now for about six and a half years) instead conceded, and wished Martinez well.