Peter Hollens is an American pop singer and producer best known for his work on YouTube as an a cappella cover artist. With 1.5 million subscribers, his videos have reached a quarter of a billion views on FaceBook and YouTube since 2011. Hollens has collaborated and performed with several outstanding artists including Brian Wilson, Jason Mraz, Hunter Hayes, Gladys Knight, Lindsey Stirling, George Watsky, Jackie Evancho, and ThePianoGuys.

He has released over 125+ digital singles to date and continues to release new music every other week. He has been involved with a cappella music since 1999 when he co-founded the University of Oregon's male a cappella group On The Rocks. In 2010 he and the group were featured on NBC's The Sing Off Season 2.

Hollens also advises many companies including Patreon, Loudr, Tubular and is on the YouTube creator advisory board.