Here's an excerpt from a 1985 interview with Baker (mostly about his relationship with Lars Gullin) that touches upon Twardzik and Bob Zieff.
"We made one album in Paris and we were supposed to do another album. This day we were all in the studio waiting and he didn't come, he didn't come, he didn't come. Peter [Littmann] went back to his hotel and they broke his door down and they found him in there. Nobody knows whether it was an accident or what, but Dick Twardzik was some kind of talent.
You can tell from the record with all those Bob Zieff tunes. That album was way ahead of its time, it didn't go anywhere. He wrote one tune on that album, I think it was The Girl from Greenland; it's such a nice tune (hums).
– I think that he and Lars influenced each other. They met briefly but they must have exchanged ideas and I think Lars learned from that. "He was unbelievable, I had never heard such things before", Lars said about him.
They can have influenced each other; anybody with any musical sense at all would have been influenced by either one of them.
Those Bob Zieff tunes were a real challenge to me, because they were so different from what I'd been doing up till that time. I was always sad because that album never received the recognition it should have.
Bob Zieff was, is, because he's still alive and lives in Hollywood, a wonderful composer. All those tunes were completely different from one other. They had a different mood and a different feel to them, and so original. Sad Walk, Rondette, Mid-Forte, Piece Caprice – a really wonderful album and I enjoyed it so much."
Zieff contributed several very knowledgable entries to "The New Grove Dictionary of Jazz," all about older players, most of them brassmen e.g. Mutt Carey, Charlie Green, Sandy Williams, Johnny Dunn, Tommy Ladnier. The contributors list locates him in Carlisle, Pa., not Hollywood, as of 1994. He used to contribute occasionally to another jazz-oriented list. I got the impression that jazz scholarship has been his chief interest for some time.