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Mark Sigman, MD has over 20 years of experience in the diagnosis and treatment of urologic and reproductive problems. He is an internationally recognized expert on male infertility and sexual dysfunction. He is chief of urology at Brown University, Rhode Island Hospital and at the Miriam Hospital. He has authored more than 100 publications in the areas of male reproductive medicine and surgery and also has lectured extensively throughout the country on this topic. He is past president of many different societies, including the New England section of the American Urological Association, the Society for the Study of Male Reproduction, and the Society of Reproductive Surgeons.