Michael Robert Henrion Posner ( POHZ-nər; born February 12, 1988) is an American singer, rapper, songwriter, and record producer from Detroit. He signed with J Records in 2009 to release his debut single "Cooler Than Me" the following year. It peaked at number six on the Billboard Hot 100 and received septuple platinum certification by the Recording Industry Association of America (RIAA). His follow-up single, "Please Don't Go" peaked within the top 20 of the chart and received triple platinum certification; both songs preceded the release of his debut album, 31 Minutes to Takeoff (2010), which peaked at number eight on the Billboard 200 and saw mixed critical response. He parted ways with J Records in favor of Island Records in 2014.

In 2015, an EDM remix of his song "I Took a Pill in Ibiza" peaked in the top ten on the charts in 27 countries, and the top five on the Billboard Hot 100. Its success led to the release of his second studio album, At Night, Alone (2016), which had a similar commercial reception and a slight improvement in critical response. His third and fourth albums, A Real Good Kid (2019) and Operation: Wake Up (2020) were both met with critical praise despite failing to chart.

Along with his recording career, he has served as a record producer and songwriter for acts including Justin Bieber, Big Sean, Maroon 5, Iggy Azalea, Big Time Rush, Austin Mahone, Nick Jonas, Cher Lloyd, and Labrinth. In 2017, Posner released his first book of poetry, Tear Drops & Balloons. He is also one half of the alternative hip hop duo Mansionz with blackbear, a Florida rapper.