Irwin is currently the director of Cummins | Cederberg Coastal and Marine Engineering. She earned her Bachelor’s in Biology and Environmental Studies from the University of Southern California and her Master’s in Oceanography from Florida State University. She has also worked as an Adjunct Professor of Microbiology and Biology at Florida State College at Jacksonville and has run her own environmental consulting firm, DHF Consulting, Inc.
She also was Deputy Director for the Division of Water Resource Management with the Florida Department of Environmental Protection. Irwin ran for Leon County Commission in 2020.