Surfing the World Showed Kelly Slater How Delicate Nature Is. Now He’s Working With Outerknown CEO Mark Walker to Reach Full Circularity by 2030. Posted byEmily Rella November 5, 2021 Leave a comment on Surfing the World Showed Kelly Slater How Delicate Nature Is. Now He’s Working With Outerknown CEO Mark Walker to Reach Full Circularity by 2030. Outerknown is a sustainable clothing brand that was founded in 2015 with the hopes of reducing textile waste in the fashion industry.