Fab was born and raised in the Philippines, where he won several high school math competitions and was Valedictorian of his graduating class. He attended the University of the Philippines at age 16 where he won a number of awards in student ideas competitions and has been published in the field. He subsequently received his Master’s in Architecture from the State University of New York at Buffalo, doing his graduate research in Material Culture. At Buffalo, he participated in a semester abroad in Spain and also received the Henry Adams Award for Excellence in Architecture, a national award given to the top-ranking graduate. Fab worked for a New York City design-build firm as a project manager after his graduation.
In 2017, Fab emigrated to the United States to join his husband, Ellis, after a three-year long-distance relationship. An avid runner, Fab dabbles into the world of art and performance during his free time.