Miriam Elizabeth Simpson

1894 - 1991

Miriam Elizabeth Simpson (1894–1991): Architect of Modern Endocrinology

Miriam Elizabeth Simpson was a formidable figure in 20th-century science whose work bridged the gap between pure chemistry and clinical medicine. Though her early training was in chemistry, she became a titan of anatomy and experimental biology. Her career was defined by a relentless pursuit of the "master gland"—the pituitary—and her efforts led to the isolation and characterization of the hormones that govern human growth, reproduction, and stress responses.

1. Biography: A Dual Path in Science and Medicine

Miriam Elizabeth Simpson was born on May 26, 1894, in Sheridan, Wyoming. Her academic journey began at the University of California, Berkeley (UCB), where she earned her Bachelor’s degree in Chemistry (1915) and a Master’s degree (1916).

While her foundation was in the exactitude of chemistry, she was drawn to the biological mysteries of the human body. She pursued a PhD in Anatomy at Berkeley, which she completed in 1921. Recognizing that the burgeoning field of endocrinology required a deep understanding of clinical pathology, she then moved to Baltimore to attend Johns Hopkins University, earning her MD in 1923.

Returning to Berkeley, Simpson joined the faculty of the Department of Anatomy. She rose through the ranks during an era when women in senior faculty positions were exceedingly rare. She spent her entire professional life at Berkeley, eventually serving as a Professor of Anatomy and the Acting Director of the Institute of Experimental Biology (1952–1958). Even after her formal retirement in 1961, she remained an active "Emerita" researcher for decades, maintaining a presence in the lab well into her 90s.

2. Major Contributions: Decoding the Pituitary Gland

Simpson’s primary contribution to science was the systematic isolation and biological validation of hormones secreted by the anterior pituitary gland. Working at the intersection of protein chemistry and experimental surgery, she developed the methodologies required to prove that specific chemical substances caused specific physiological changes.

Growth Hormone (GH) Purification: Alongside her colleagues, Simpson was instrumental in the first successful isolation of the growth hormone. She developed the "tibia test," a highly sensitive bioassay that measured the widening of the epiphyseal cartilage in the rat tibia to determine the potency of GH samples.
Gonadotropic Hormones: She played a lead role in distinguishing and purifying Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH). Her work established how these hormones regulated the ovaries and testes, providing the foundational knowledge for modern reproductive medicine and fertility treatments.
ACTH and the Stress Response: Simpson was part of the team that isolated Adrenocorticotropic Hormone (ACTH), which triggers the adrenal glands. This was a monumental discovery for understanding how the body responds to stress and inflammation.
Standardization of Bioassays: Before the era of automated chemical analysis, the only way to "measure" a hormone was to see its effect on a living organism. Simpson perfected the "hypophysectomized rat" model (rats with their pituitary glands removed), which became the gold standard for testing hormonal extracts worldwide.

3. Notable Publications

Simpson was an incredibly prolific author, contributing to over 200 scientific papers. Her most influential works often focused on the synergy between chemical purification and biological effect:

"The Growth and Gonad-Stimulating Hormones of the Anterior Hypophysis" (1933): Co-authored with Herbert M. Evans, this monumental memoir laid out the evidence for distinct pituitary hormones.
"Isolation of the Adrenocorticotropic Hormone from the Pituitary" (1943): Published in The Journal of Biological Chemistry, this detailed the chemical steps to isolate ACTH.
"Purification of the Follicle-Stimulating Hormone from the Anterior Pituitary" (1940): A landmark paper in Endocrinology that clarified the separation of FSH from other pituitary factors.
"The Tibia Test for Growth Hormone" (1950): This paper codified her most famous bioassay technique, which remained in use for decades.

4. Awards & Recognition

Guggenheim Fellowship (1950): Awarded for her research in endocrinology, allowing her to collaborate with international scholars.
The Koch Award (1954): The highest honor bestowed by The Endocrine Society, recognizing her "exceptional contributions to the field of endocrinology."
Honorary Doctorate, University of Aix-Marseille (1951): Recognition of her international influence on European medical research.
The Berkeley Citation (1964): Awarded upon her retirement for her distinguished service to the university and her pioneering role as a woman in science.

5. Impact & Legacy

Miriam Simpson’s legacy is embedded in every pharmacy and fertility clinic in the world. By proving that the pituitary gland was a chemical factory, she enabled the development of:

Synthetic Growth Hormone: Used to treat growth disorders in children.
Fertility Treatments: The use of FSH and LH in IVF and other reproductive technologies stems directly from her purification work.
Corticosteroid Therapy: Her work on ACTH paved the way for treating autoimmune and inflammatory diseases.

Beyond her research, she was a trailblazer for women in academia. At a time when women were often relegated to technician roles, she directed major research programs and mentored a generation of endocrinologists.

6. Collaborations: The Berkeley Powerhouse

Simpson was a key pillar of the "Berkeley school" of endocrinology. Her most significant collaborations included:

Herbert McLean Evans: The legendary anatomist and co-discoverer of Vitamin E. Their partnership lasted over 40 years. While Evans was often the public face of the lab, Simpson was the meticulous experimentalist who provided the rigorous biological proof for their discoveries.
Choh Hao Li: A world-renowned protein chemist. Li would perform the complex chemical separations, and Simpson would perform the biological assays to tell him if the "fraction" he had isolated was actually the hormone they were looking for.
Gertrude Van Wagenen: A fellow anatomist with whom she collaborated on primate reproductive studies, extending her rat-based findings to higher mammals.

7. Lesser-Known Facts

The "Simpson Standards": Among graduate students, Simpson was known for her legendary—and sometimes intimidating—attention to detail. She reportedly insisted on performing or personally supervising every surgical procedure on her test animals to ensure zero variance in the data.
A "Chem-Anatomist": She was one of the few researchers of her era who could speak the language of both organic chemists and medical doctors fluently, which allowed her to act as a "translator" between the two fields.
Longevity in the Lab: Simpson never truly stopped working. She was known to walk to her office at Berkeley well into her 90s, keeping up with the latest journals and offering critiques to younger faculty members. She lived to the age of 97, witnessing the field she helped create evolve from crude organ extracts to recombinant DNA technology.