Marv has been a mainstay for many years in the music scenes from Philly to Baltimore Metro to DC to the Atlantic resorts (and occasionally Myrtle Beach, SC). He has been a lead singer in groups like The Decades, a Motown/R&B 10 piece band, and The Deacons, an originals, blues, rockabilly, alternative roots group. He has been the bassist and one of the lead singers in bands like Scrimshaw, Head Over Heels, 2BitRevue, Fabulous Sluggos, Graffiti, Tommy Roberts & The Tristeros, Blues You Can Use, and Gamler's Ramblers (aka The River Band), Denim n' Lace, Strait Shooter, When Thunder Comes, Kallok & Steele Group, Smokin' Otis Blues Band, In a Bad Way, Boyler Makers, Old Crippled & Crazy, and Mo' Love. He performs individually at various coffeehouses and fundraisers and is a standby bassist for various groups. When not appearing with his own group, UXO, or KING LEWMAN (since 2004), he can be found onstage otherwise at jams, open mics, coffeehouses, and invitationals.

To keep his chops up, to retain his edge, and to remain nimble, he is an Organizer and an active member of the Baltimore Guitarist Group, a community of musicians who hold open mics, perpetrate jams, and raise funds for Little Kids Rock to help promote music education. He is also a member of Acoustic Guitar & Musicians Group, Baltimore Live Music Meetup Group, Home Recorders & Mixers, and Delmarva Deadheads!

He has been a booking agent, manager, promoter and producer for groups like Tregwater, The Illuminati, Richard Taylor & The Ravers, Silent Partner, Fate, and, of course, bands for whom he plays through the auspices of his company, LGM Enterprises and its subsidiary, Thuh SwitchingYard, an arts, events and media consortium. Marv was one of the performance coordinators who helped develop Open Door Cafe in Bel Air, MD.