He has been a guest on various television talkshows , where he goes by the name Dr. Bill .
William Penton Sears ( born December 9 , 1939 ) is an American pediatrician and the author or co-author of parenting books .
William Penton Sears has been a pediatrician on various television talkshows , where William Penton Sears goes by the name pediatrician pediatrician .
William Penton Sears ( born December 9 , 1939 ) is an American pediatrician and the author or co-author of parenting books .