Brittany Stewart first heard of Hamish Khayat via a friend. “I’d been involved in this charity organisation called ThursdayNights, which brings together founders and funders of businesses in LA,” she says, from a plush chair where she drinks an espresso martini in The Westbury’s upstairs lounge. Her tone is vibrant, excited, open. “And one of my buddies was like, ‘Hey, I was surfing with this guy this morning, and I just think you should meet him’. I was like, ‘Okay, okay, I’ll think about it’. But then, multiple different people in our circles kept trying to get us to meet.” Several months…