Stallings joined FHFA in 2011 and most recently served as Examiner-in-Charge of the Office of Fannie Mae Examinations within the Division of Enterprise Regulation (DER). Previously, he served as the Examiner-in-Charge of the Office of Freddie Mac Examinations and the Boston and Cincinnati FHLBanks.

While serving in different capacities at the FHFA, Stallings also received the Housing Finance Examiner Commission, became an Excellence in Government Fellow, and completed the Stonier Graduate School of Banking. He began his supervisory career with the Office of Thrift Supervision, where he received his Federal Thrift Regulator commission. Stallings received a Bachelor of Business Administration with a focus in Economics from the University of Georgia.