Grant Gustin has been active in theater and arts from an incredibly young age. During his high school years, Grant attended the Governor's School for the Arts program in Norfolk, Virginia for Musical Theatre. He also went to Hurrah Players Incorporated which is a theatre organization in Virginia. In 2008, he graduated from Granby High School and went on to attend the BFA Music Theatre Program at Elon University in North Carolina for two years.

He left school to take the role of Baby John in the Broadway Revival Tour of "West Side Story" and performed with the tour from its opening on September 30, 2010 through September 23, 2011.

On November 8, 2011, he debuted on the television series "Glee" as Sebastian Smythe, an openly gay member of the Dalton Academy Warblers. Gustin won the recurring role of Sebastian, a promiscuous and scheming character, after "an exhaustive, weeks-long casting search". He originally auditioned for a role as a tap dancer, but did not get the part. However, Ryan Murphy kept him in mind. He began filming the role early on Monday, September 26, 2011, after having finished his final West Side Story performance the Friday night before.

On September 13, 2013, it was announced that Gustin would play Barry Allen, or The Flash, in the second season of the CW's critical favorite "Arrow." He appeared in a few episodes of the series before the network decided to spin the character off into it's own series. "The Flash" will premiere in Fall 2014.

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