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Guttmacher was a graduate of {{UNI|Johns Hopkins University |JHU}} and the Hopkins Medical School. He served as Director of Obstetrics and Gynecology and was appointed Obstetrician and Gynecologist-In-Chief at Mount Sinai Hospital in New York for approximately ten years. In 1962, ten years after moving to New York, he became president of the ''Planned Parenthood Federation''. He extended this endeavor by founding the ''Association of Planned Parenthood Physicians'' which included scientists and medical practitioners. From 1964 to 1968, he served as Chairman of the Medical Committee of the ''International Planned Parenthood Federation''. Guttmacher was also a fellow of the American College of Obstetrics and Gynecologists, the American Fertility Society, New York Academy of Medicine, and the American Association of Obstetricians and Gynecologists.<ref>"Dr. Alan Guttmacher dies." ''The Baltimore Sun''. 19 March 1974.</ref>

Although Guttmacher was probably [[circumcised]] on the eighth day of life in accordance with the [[Abrahamic covenant]], and would have no personal experience of a [[foreskin]], he claimed expert knowledge. As a [[circumcised]] doctor, one would expect him to be biased in favor of [[circumcision]]. In 1941, Guttmacher erronously claimed that the presence of a [[foreskin]] would cause dirt to collect under the [[Foreskin#Foreskin_in_infancy_and_childhood| foreskin in newborns]]. He spread the false claim that a baby's foreskin must be forcibly retracted and scrubbed daily which is basically impossible without violence due to the [[synechia]] which adheres the foreskin to the [[glans]]. He promoted mass [[circumcision]] as a means of blunting male [[Foreskin sensitivity| sexual sensitivity]].<ref name="Guttmacher1941">{{REFjournal