Henry George Burger is distinguished for his outstanding contributions in medical practice and medical research. He achieved the isolation, purification, cloning, sequencing and determination of the regulation of the hormone inhibin. Sperm production and ovulation are modulated by this feedback signal to the pituitary gland. Involved in treatment of patients with a variety of hormonal disorders, his work with infertile couples has brought greatest international recognition. He has achieved world leadership in investigation and treatment of infertile males and females. His inhibin measurements provide the complete source of information about functions and disorders of inhibin secretion in man.