Markus Anderson has reportedly been one of Markle's friends for a long time. The Ontario-born Soho House Group consultant started out as a waiter at the boho-chic members club in London before working his way up to global membership director and then consultant. He met Markle when he moved to Toronto in 2012 to set up a branch of the club there, once saying of his role, "When Soho House decides to open in a new city, I'm one of the first people sent out to get to know the city, the creatives that live there, and determine who we want to involve in the house."
Markle and Anderson have traveled the world together and often act as each other's dates for media events and weddings; she even referred to him as her dogs' "uncle." Anderson was in the VIP box with Markle and Harry at the closing ceremony of the Invictus Games in 2017. Markle and Markus were spotted grabbing dinner together during her visit to NYC in February 2019. In May 2022, Anderson attended a polo match with Markle, where they watched Harry play.