Slaiby was born in Lebanon in 1979. He escaped the Lebanese Civil War conflict and immigrated to Canada at age 15 without his family. He initially lived in Montreal before moving to Ottawa in his late teens. While in Ottawa, he met the rapper, Belly, who convinced him to get into the music business.
In 2002, Slaiby co-founded Capital Prophets Records with Belly, which would go on to be known as the CP Music Group. Rapper Belly and singer Massari were the first artists signed to the new record label by Slaiby. Massari's 2005 self-titled album was certified Gold in Canada and garnered a Juno Award nomination. Belly's 2007 album, The Revolution, won the Juno Award for Rap Recording of the Year. In late 2012 around the time The Weeknd released his album Trilogy, Slaiby began co-managing the singer with Amir "Cash" Esmailian. By 2014, his CP Music Group had also added producers DaHeala and DannyBoyStyles to the roster. In 2015, Slaiby became the CEO of The Weeknd's XO record label. The Weeknd would go on to win two Grammy Awards in 2016 for work on his 2015 album, Beauty Behind the Madness. In May 2016, Slaiby partnered with Guy Oseary's Maverick Management consortium, bringing his roster of The Weeknd, Belly, French Montana, and Massari into that fold. He also brought along producer-songwriters, DaHeala, DannyBoyStyles, Breyan Isaac, and Ben Billions. Slaiby began operating as SAL&CO/Maverick at that time, as well. He also manages other artists including London On Da Track, Ali Gatie, Harry Fraud, and Metro Boomin. In December 2017, Slaiby joined the Lebanon-based music streaming service, Anghami, as the head of international partnerships. He also joined the advisory board of Global Citizen in the same year. In 2018, he helped bring Shakira to the Cedars International Festival in Lebanon and also joined the board of the XO-backed artist collective, HXOUSE. In April 2019, Slaiby was invited as a guest speaker to the Brilliant Minds 2019 edition where he was among a panel of speakers that included Barack Obama, Even Spiegel, and Hartmut Neven.
In 2017, Slaiby and French Montana helped build the Suubi Hospital in Uganda in conjunction with Global Citizen and Mama Hope. In February 2018, he joined the advisory board of Global Citizen. In November 2018, he canceled his annual birthday party as a result of the deadly wildfires in California and urged his followers in an Instagram post to donate to the Los Angeles Fire Department and the California Community Foundation's Wildfire Relief Fund.