He had his breakthrough with romantic lead roles in the Disney film Hannah Montana: The Movie and music videos for Taylor Swift's "You Belong with Me" and Miley Cyrus' "The Climb" (all 2009).

The action comedies The Spy Next Door (2010) and Monster Trucks (2016) brought him wider attention, and he portrayed Havok in Marvel's X-Men prequel films (2011–2016).

He subsequently garnered critical acclaim for his portrayal of Bob Zellner in the historical biopic Son of the South (2020), before starring in the action film The Collective (2023).

When he was 11 his mother enrolled him in local acting classes, and it was not long before he was discovered by Joy Pervis, an agent from a Talent agency in Atlanta.

[13] In 2008, Till starred as Jensen in Gregg Bishop's horror-comedy Dance of the Dead which was hand-picked by director Sam Raimi for distribution through Lions Gate Entertainment and Ghost House Pictures.

[14] He was also invited to participate in the fifth season of the American television series House in the episode titled "Joy to the World" in the role of Simon, a high school student who has a romantic relationship with his schoolmate, but due to their social differences, they cannot be together.

[24] He was also part of the starring cast in the movie The Lost & Found Family released directly in DVD format and distributed by Sony Pictures Home Entertainment.

[26] That same year, he played Matt Parker, a high school quarterback in the first season of Blue Mountain State in the episode titled "The Legend of the Golden Arm".

In 2012, Till returned to work in dramas by participating in the movie Dark Hearts in the role of Sam, a young man who travels to the city to spend time with his older brother and thus escape problems at home.

[38] In 2014, he returned to movies in the horror genre by participating in the film Wolves as Cayden Richards, a high school student who is becoming a werewolf and who after the murder of his parents tries to discover the truth of who he really is.

in the first episode of the third season titled "Patton Oswalt Wears a Black Blazer & Dress Shoes"[42] and reprised his role as Havok in X-Men: Days of Future Past, the sequel to 2011's First Class.

Mac is a secret agent of a United States government organization that uses his extraordinary talent to solve problems and his extensive knowledge of science to save lives.

[48] Paramount Animation together with Nickelodeon Movies produced the comedy and adventure film titled Monster Trucks, directed by Blue Sky Studios founder Chris Wedge in which Till starred as Tripp.

[49][50] During 2016 and 2017, he started working on a project as a co-producer, the science fiction and suspense film Spectrum playing the role of a young scientist named Connor.

[51] He also participated in the one-hour animated television special titled Michael Jackson's Halloween which premiered on CBS in October 2017 lending his voice to the character of Vincent, a young store clerk who wants to be DJ.

[58] Written and directed by Barry Alexander Brown, the film received mixed reviews from critics, although Till's performance was widely praised.

[60][61] In March 2024, Till was cast as Garret Van Ness in the upcoming Netflix western series The Abandons,[62] starring opposite Gillian Anderson and Nick Robinson.