He grew up in Manassas, VA and received his BFA in illustration from Syracuse University, where he also studied sculpture, including a semester in Italy. After graduating he became a full-time apprentice in a stone shop outside of Washington, DC before coming to Baltimore to earn his MFA at the Maryland Institute College of Art's Rinehart School of Sculpture.

Following graduate school he founded Atlantic Custom Carving, LLC. His current studio is part of the stone shop at Hilgartner Natural Stone Company in downtown Baltimore where he works on commission stone carving and restoration as well as his own personal sculpture. He is also an adjunct professor in the Illustration Department at MICA.

Sebastian's sculptural work was recently selected to be featured in "40 Under 40: Craft Futures," the 40th Anniversary exhibition of Renwick Gallery of the Smithsonian American Art Museum. His sculpture, Impressions, was acquired by the museum and is now part of their permanent collection.