Sebastian started his career with a solo commercial role as the little hitter who wouldn't quit in a PA commercial on "Optimism" that screened internationally online and at Pro Baseball Games. He worked with Timothy J. Nelson on The Assignment (2010), playing Cody, the comic relief, little brother. He played in a role opposite his real sister, Stefania Barr , and Savanna Kylie Lewis as a mystery boy in Once Upon a Summer (2009). He stars in his first lead role as Tommy in Fifty Cents (2008). Set in the 1950's, this film tackles the age old question, "How do you get the girl?" One of his favorite roles was playing opposite Eric Roberts for a week as father and son in the movie The Wayshower directed by Jsu Garcia. This was a great experience to work with seasoned professionals with many years of acting and insight. Eric and Sebastian enjoyed a great friendship on set that is so visible on screen.

Brother of Stefania Barr and Jean-Christian Barr .Sebastian is the brother of Stefania Barr and Jean-Christian Barr who also work in film. His whole family combined with Utah film makers to produce their own film set in the 1950s. Sebastian got to keep the cool old Schwinn from the film.Sebastian is also a musician/vocalist in the band Shrink the Giant.