Jean “Johnny” Pigozzi received his first camera as a gift from his parents, at the age of 9. “If you’re a painter, you can sit alone in front of your canvas, but with photography, you always need a subject,” says the artist and art collector, who has had as many exhibitions for his own work as for his trove of African art, among the largest in the world. His latest book, The 213 Most Important Men in My Life, pays tribute to the array of eccentric characters who have inspired him over the past six decades, including the Italian architect Ettore Sottsass, Andy Warhol, Mick Jagger, Michael Douglas, and Gianni Agnelli. The project, Pigozzi says, is his way of thanking all the mentors he has had over his lifetime, after…