Auld received his bachelor's degree in economics and master's degree in education from Stanford University. He obtained his MBA from Harvard Business School. He became the lead teacher and director of development at East Palo Alto Charter School in East Palo Alto, California.
Auld joined the Rays as their director of planning and development in June 2005, reporting into Matthew Silverman, the team's president. He was later promoted to senior vice president of business operations. When Andrew Friedman, the general manager of the Rays, left the team to become president of the Los Angeles Dodgers after the 2014 season, Silverman became the team's new general manager, with Auld being promoted to team president.
Auld grew up in Berkeley, California, Scarsdale, New York, Tokyo, Japan and Dallas, Texas. He graduated from the St. Mark's School of Texas. At Stanford, he was captain of the varsity lacrosse team.  He lives in St. Petersburg, Florida. He and his wife, Molly, have two children, Lucy and Jack.
- "Matt Silverman, Brian Auld fill new roles with Tampa Bay Rays". Tampa Bay Times. Retrieved October 15, 2014.
- "Catching Up With Rays Senior VP/Business Operations Brian Auld". Retrieved October 15, 2014.
- Fox Sports. "Tampa Bay Rays reorganize front office with departure of Andrew Friedman". FOX Sports. Retrieved October 15, 2014.
- "Brian Auld". MLB.com.