Some of his surfing inspirations are Andy Irons, Shane Dorian, Josh Kerr, Drew Phelps, Seany Mc Donald, Weston Dunlap, Taylor Lobdell, David Goldberg, Andrew Bloom, Charles Webster Baer, Michael Wyllie, Alex Siddiqui, Shane Beschen, Ashleigh Vaughan Trotman, Ian Michaelson ( https://soundcloud.com/ian-michaelson/sets ) and Dane Reynolds.He appeared in an episode of the reality show The Girls Next Door, and has starred in many surf films during his career.
In 2003 Slater released his autobiography, Pipe Dreams: A Surfer's Journey.
In 2008 he released a second book with Phil Jarratt, entitled Kelly Slater: For the Love.
The inspiration for this brand comes from the people and cultures I encounter in my constant global travels and this is my opportunity to build something the way I have always wanted to." and after Leaving Quiksilver, Slater, in collaboration with Kering, established the eco-friendly and sustainable apparel company 'Outerknown', further building on his passion for the environment and sustainability.
He historically and exclusively rode Channel Islands Surfboards equipped with his own signature series of FCS fin masons.
Slater credits Davis in his biography stating "Brandon's knowledge and poise in large surf had a huge impact on my career.
Anytime I'm dropping in a big wave, I think back to that wink in the Makaha parking lot and I push myself over the ledge." In May 2005, in the final heat of the Billabong Tahiti Pro contest at Teahupo'o, Slater became the first surfer ever to be awarded two perfect scores for a total 20 out of 20 points under the ASP two-wave scoring system (the corresponding honor under the previous three-wave system belongs to fellow American Shane Beschen who achieved the feat in 1996).
In the late 1990s Slater, with friends and fellow pro surfers Rob Machado and Peter King, formed a band called The Surfers.
The trio released an album in 1998 titled Songs from the Pipe, a reference to the famous surf spot Pipeline on Oahu, Hawaii.
After earlier being awarded the title prematurely as a result of a miscalculation by the Association of Surfing Professionals (ASP), on November 6, 2011 Slater officially won his eleventh ASP world title at the Rip Curl Pro Search San Francisco, by winning his 4th round heat.
Slater, having grown up in Florida, was never truly comfortable in waves of consequence until a trip to Oahu in 1997.
He is the youngest (at age 20) and the oldest (at age 39) to win the title.