Research notes
Stuart King is a multiple-title-winning veteran race engineer whose career began in Formula Renault/WSR (two-time WSR drivers' champion). In 2016 he led Sirotkin to the GP2 runner-up spot at ART Grand Prix, and since 2018 he has subcontracted through his own company, Shift Motorsport, to work for Carlin/Rodin, guiding Lando Norris to the 2018 teams' championship;
he is now Rodin's F2 chief engineer. A Getty Images caption confirms 'Stuart King, Engineer of Rodin Motorsport' collecting an award at the F2 Imola round;
the About page of his own company, Shift Motorsport, states that Stuart King is a multiple-title-winning race engineer who has worked for Carlin (now Rodin) on a subcontract basis since 2018;
his LinkedIn title lists Race Engineer and founder of Shift Motorsport. All three sources corroborate the same person.