He has a television production company with Tom Fontana (The Levinson/Fontana Company) and served as executive producer for a number of series, including Homicide: Life on the Street (which ran on NBC from 1993 to 1999) and the HBO prison drama Oz.
Osim toga, s Tomom Fontanom je osnovao televizijsku produkcijsku kompaniju (The Levinson/Fontana Company) te se pojavio kao izvršni producent na nekoliko serija, kao što su Homicide: Life on the Street (koja se prikazivala na NBC-u od 1993. do 1999.) i HBO-ova zatvorska drama Oz.