 Past high-profile speakers include Sir David Attenborough, Louis Theroux, Nick Broomfield, Stacey Dooley, Joanna Lumley, Reggie Yates, Walter Murch, Michael Moore, Kim Longinotto, Tilda Swinton, D. A. Pennebaker, John Akomfrah, Brett Morgan, Sue Perkins, and Joan Rivers.MeetMarket & Alternate Realities Market is a documentary pitching event held at Sheffield Doc/Fest, where filmmakers pitch their project ideas one-on-one to UK and international broadcasters, funders and distributors.Former Festival Director Heather Croall introduced MeetMarket to Doc/Fest in 2006 and developed it as an alternative to public pitching (where filmmakers pitch to a large audience).