Maslow made his acting debut in 2008 as Shane in an episode of the Nickelodeon show iCarly. He also appeared in urFRENZ in 2009, in which he portrayed a character named Brandon. In 2012, he filmed an episode of See Dad Run, playing the role of actor Scott Baio's former TV son, Ricky. In 2007 Maslow sent his audition tape for a new Nickelodeon sitcom and received the role of James Diamond two years later in the show Big Time Rush, along Kendall Schmidt, Carlos Pena, Jr. , and Logan Henderson. They also formed the real boyband Big Time Rush. An album of original songs from the first season plus some others was released October 11, 2010, entitled B. T. R. It sold 67,000 copies in its first week and was certified Gold by the RIAA five months later in March 2011. On November 21, 2011, the band released their second album called "Elevate" which sold over 70,000 copies on its first week. Maslow and his bandmates co-wrote 8 out of the 12 songs. Maslow wrote "Elevate", co-wrote "Love Me Love Me" and the first single from the album, "Music Sounds Better With U". The UK version of the album included a bonus song called "Epic" which he also helped write.