Photo historian and author J. L. Pickering has conducted photo research into the US manned space program for nearly fifty years-acquiring, organizing, and restoring more than 250,000 prints, slides, transparencies, and digital files, the largest such private archive. His sources include government archives, NASA retirees, news photographers, private collectors, and auction houses. One of the world's leading manned space photography experts, he is regularly contacted by authors, retired astronauts, and even NASA for photo assistance.