The Ultima Codex site has put up an interview with ex-Origin Systems programmer Jason Ely. While most of the interview focuses on his involvement in Ultima VIII, he talks about his work on the Crusader games as well.
After Ultima 8 I was offered positions on Ultima 9 and Ultima Online. I really enjoyed working on Ultima 8 a great deal. The only downside to working on a game that you also love to play is that some of the magic and mystery is lost as a developer. You know pretty much every secret and you know how it is going to end. So I guess you can say I enjoy playing them more than making them. I chose to go with Tony Zurovec and start the Crusader series.
Check out the full interview here.