Conversation so far:
What was the voodoo influence on Dr. John?
As a young man Rebennack was interested in New Orleans voodoo, and in Los Angeles he developed the idea of the Dr. John persona for his old friend Ronnie Barron

Question: So what did he do with the Dr John persona ?
Self-contained rewrite: So what did Malcolm John Rebennack Jr. do with the Dr John persona ?