Conversation so far:
How do celluloid records have anything to do with Laswell?
Laswell became the de facto house producer for Celluloid until the sale of the label in the later 1980s.
Where were they located?
Within a few years of moving to New York, Laswell founded a recording studio.

Question: Was there anyone else involved in the label with him?
Self-contained rewrite: Was there anyone else involved in the label besides Bill Laswell?