Do the names John Hartin and John Rettig sound familiar? I found an article in the Spring 1990 Sierra newsletter about them working on Space Quest III for the Macintosh.
https://archive.org/details/Sierra_News_Magazine_The_Volume_3_Number_1_Spring_1990_1990_Sierra_On-Line_US/page/n25
Thanks again for responding, before, I’ll do a search online and see what I can turn up.
Steve.