Alan Edwards, who was Bowie’s publicist for nearly four decades, was the show’s consultant producer.
He told BBC Bowie had kept a lot of his personal archive.
“There’s a warehouse in New York with books and everything you could think of, all his stage shows and more,” he said.
“Mark Grimmer, the main organiser of the exhibition, went to the warehouse and began opening boxes and cans of film, tape and things that had never been seen before.
“He pieced together all the words, so we have a show in David’s own voice, which was quite incredible.”
Edwards said it was “not easy” to put together the show, describing it as a “labour of love”.