See full bio » Thomas Grant Gustin, better known as Grant Gustin, is an American actor and singer. He is known for his roles as Barry Allen / Flash on the CW series The Flash and as Sebastian Smythe on the Fox series Glee. Gustin was born on January 14, 1990 in Norfolk, Virginia. He is the son of Dr. Tina Lynne (Sweeney) Haney, a pediatric nurse, and Thomas Avery... Born: January 14, 1990 in in Norfolk, Virginia, USA