Dear Ms. Heintz,
Thank you for posting your request on History Hub!
The Pan-American Exposition was organized by the Pan-American Exposition Company. Records of the company are the the custody of The Buffalo History Museum. We contacted them and were informed that they may have information concerning some of the people who worked there. However, they also cautioned that many of the exhibits and entertainment venues were staffed by outside organizations. They suggested that you email them at firstname.lastname@example.org for further assistance.
We hope this information is helpful. Best of luck with your research!