Anyone familiar with the bassist playing a Series for Gil Scott Heron?

VMG

Some sleuthing finds that Danny Bowens was Gil Scott Heron's bass player from 1972 to 1978; and the video is from 1976, Old Grey Whistle Test show.

There's a nice Alembic shot in this video from 1975; Winter In America.

Yes.  The latter video features the Great Robbie Gordon....

Ah!  Thanks!  I couldn't find any good pictures of Bowens, so I wasn't sure it was him.

There is a Showcase thread dedicated to The Secretary of Entertainment, and another one http://club.alembicguitars.net/index.php?topic=8137.0

Two of my heroes who played for another hero. Seeing GSH back in the day was an amazing experience. Danny's still out there playing and Robert Gordon is as well (amazing, his Allmusic bio was written by Eugene Chadbourne. A juxtaposition I never would have imagined!).

https://www.allmusic.com/artist/robbie-gordon-mn0000830265/credits