Since 1957, Photo Researchers Inc. is a provider of photography and illustration to the advertising and publishing industries in the global market. Based in New York, N.Y., the company's science source division stocks a range of medical, science and technology images. In addition, it operates nature source division that specializes in nature, wildlife and environmental imagery. Photo Researchers Inc. maintains a collection of travel and lifestyle photography. The firm supplies traditional right-managed and royalty-free images. Its list of clients includes Commonhealth, Cline Davis Mann, Sudler Hennessey, Pearson Education, Scholastic Inc., Houghton Mifflin Harcourt, The McGraw-Hill Companies, National Geographic and Time Warner Inc.