- From the San Francisco Bay area.
- He is of Italian descent; his family name is Marciarelli, which was shortened to Marshall.
- 1979, was an original member of the David Grisman Quintet.
- 1983, formed the Montreux Band, a new age jazz ensemble.
- 1987, formed the Modern Mandolin Quartet.
- 1995, traveled to Brazil and studied Brazilian choro music.
- 1996, formed Psychograss with Darol Anger, David Grier, Todd Philips and Tony Trischka.
- 1999, recorded and performed with Edgar Meyer, Joshua Bell and Sam Bush
- 2000, recorded and performed with NewGrange.
- 2002, released Into The Cauldron, an album of mandolin duets with Chris Thile (Sugar Hill).
- 2006, released Live Duets with Chris Thile (Sugar Hill).