He has written songs for artists such as Miley Cyrus, Maroon 5, Justin Bieber, Selena Gomez, Katy Perry, Jonas Brothers, Beyoncé, Lizzo, and Kelly Clarkson, among others.

[1][2] He co-wrote Maroon 5's 2020 single "Memories", which peaked atop Billboard's Radio Songs chart, along with Justin Bieber's "Ghost"[3] and Miley Cyrus' "Flowers".

During his freshman year, Billy Joel hosted a Q&A session for college students at Vanderbilt University's Langford Auditorium.

[13] The video also led to Pollack signing a joint publishing deal during his sophomore year of college with Warner Chappell Music and Pete Ganbarg, President of A&R at Atlantic Records, for its "Songs With A Pure Tone" label.

[15] After graduating from college, Pollack moved to Los Angeles, California to live with fellow musicians Ari Leff and Michael Matosic.

Pollack has also co-written songs for Beyoncé, Justin Bieber, Celine Dion, Katy Perry, Miley Cyrus, Ed Sheeran, Maroon 5, Kelly Clarkson, Jason Mraz, Backstreet Boys, Lizzo, Jonas Brothers, Meghan Trainor, Demi Lovato, Michael Bublé, John Legend and Selena Gomez.