[1] In the early 1960s, he performed with Eric Dolphy and McCoy Tyner in Charles Mingus' Jazz Workshop.

He worked as a sideman with Max Roach and Abbey Lincoln before joining Art Blakey and the Jazz Messengers.

[1] In mid-1970, he joined Miles Davis' band,[1] performing live at the Isle Of Wight festival in August; and at a series of December dates at The Cellar Door club in Washington, D.C. Portions of these shows were initially released on the 1971 Live-Evil album,[1] with the entire six performance/four night run eventually released in full on the 2005 Cellar Door Sessions box set.

[5] In 2019, Revive Music and Bartz celebrated the 50th Anniversary of his Another Earth album at Winter Jazzfest in New York City, alongside original member Pharoah Sanders.

[7] With Joe Chambers With the Rance Allen Group With Gene Ammons With Roy Ayers With Cindy Blackman With Art Blakey and the Jazz Messengers With Donald Brown With Kenny Burrell With Donald Byrd With George Cables With Norman Connors With Miles Davis With Ray Drummond With Antonio Hart With Louis Hayes With Heads of State[14] With Phyllis Hyman With Barney McAll With Jackie McLean With Grachan Moncur III With Alphonse Mouzon With Rare Silk With Max Roach With Wallace Roney With Pharoah Sanders With Woody Shaw With Sphere With Charles Tolliver With Bob Thiele Collective With Leon Thomas With Malachi Thompson With McCoy Tyner With Robert Walter With Chip White With John Lee & Gerry Brown With The Midnight Hour (with Adrian Younge and Ali Shaheed Muhammed) With Roy Hargrove