That Summer (2017) opening titles

Peter Beard discusses his work as a photographer, artist and diarist before reminiscing about his attempt to make a documentary in the summer of 1972 with his friend Lee Radziwill (younger sister of Jacqueline Kennedy Onassis), focusing on their childhood and the 20th-century history of East Hampton. — IMDb

That Summer is a documentary feature film produced by Story and Louverture films. It uncovers footage lost for decades shot by Peter Beard, Andy Warhol and Jonas Mekas, and features Lee Radziwill and the Beales of Grey Gardens, Big Edie and Little Edie. Now re-edited and directed by Göran Hugo Olsson.