Melvin Calvin
Discoverer of the Calvin cycle and Nobel laureate in chemistry.
Melvin Ellis Calvin (April 8, 1911 – January 8, 1997) was an American biochemist. He is best known for his role in discovering the Calvin cycle, working alongside Andrew Benson and James Bassham. In 1961, he received the Nobel Prize in Chemistry for his work on how plants take in carbon dioxide. The bulk of his career, spanning about fifty years, was spent at the University of California, Berkeley.
Calvin was born in St. Paul, Minnesota. His parents, Elias Calvin and Rose Herwitz, were Jewish immigrants from the Russian Empire, from what are now Lithuania and Georgia. When Calvin was young, his family moved to Detroit, Michigan, where his parents ran a grocery store. As a child, he often explored the products on the shelves to satisfy his curiosity.
After graduating from Central High School in 1928, Calvin attended the Michigan College of Mining and Technology (now Michigan Technological University). There, he earned the school’s first Bachelor of Science in Chemistry. He then completed his PhD at the University of Minnesota in 1935. Under George Glocker’s mentorship, his thesis examined the electron affinity of halogens. Following this, he was invited to join Michael Polanyi’s lab at the University of Manchester as a postdoctoral researcher. During his two years there, he studied the structure and behavior of organic molecules. In 1942, he married Marie Genevieve Jemtegaard. The couple had two daughters, Elin and Karole, and a son, Noel.
Calvin’s career at Berkeley began after a visit to the University of Manchester. Joel Hildebrand, director of the UC Radiation Laboratory, invited him to join the faculty. This made Calvin the first chemist hired by the department who was not a Berkeley graduate in over twenty-five years. Hildebrand urged Calvin to pursue radioactive carbon research, saying “now was the time.” Calvin’s early work at Berkeley built on Martin Kamen and Sam Ruben’s 1940 discovery of long-lived radioactive carbon-14.
In 1947, Calvin was promoted to Professor of Chemistry and became director of the Bio-Organic Chemistry group at the Lawrence Radiation Laboratory. His team included Andrew Benson, James A. Bassham, and others. Benson was tasked with setting up the photosynthesis laboratory, which aimed to trace the path of carbon fixation during photosynthesis. The most significant result was mapping how light energy converts into chemical energy. Using carbon-14 as a tracer, Calvin, Benson, and Bassham charted the entire route carbon takes through a plant—from atmospheric carbon dioxide absorption to its conversion into carbohydrates and other organic compounds. This process, part of the photosynthesis cycle, became known as the Calvin–Benson–Bassham Cycle. While many contributed, Calvin led the effort.
In 1963, Calvin also became a Professor of Molecular Biology. He founded and directed the Laboratory of Chemical Biodynamics, called the “Roundhouse,” while serving as Associate Director of the Berkeley Radiation Laboratory. He conducted much of his research there until retiring in 1980. In his later years, he studied oil-producing plants as renewable energy sources. He also spent many years investigating the chemical evolution of life, publishing a book on the subject in 1969.
The Roundhouse was a circular laboratory designed to encourage collaboration among students and visiting scientists. Calvin’s wide-ranging curiosity made him value cross-disciplinary work. Open scientific discussion was central to his students’ daily lives, and he wanted a community space that brought together diverse minds. To achieve this, he invited postdoctoral students and guest scientists from around the world. Within the Roundhouse, Calvin built a community where students and staff felt they could reach their potential. His management skills became well known, and many creative scientific workplaces are modeled after them today. Though he was called “Mr. Photosynthesis,” his organizational and management methods transformed the scientific community more broadly.
The discovery of the Calvin cycle built on earlier work by Sam Ruben and Martin Kamen. Their research on carbon-14 ended after Ruben’s accidental death in the lab and Kamen’s security troubles with the FBI and State Department. Still, Ernest Lawrence, the Radiation Laboratory director, valued their work and wanted it continued. Along with Wendell Latimer, the Dean of Chemistry and Chemical Engineering, Lawrence recruited Calvin in 1945. The lab initially focused on using carbon-14 in medicine and synthesizing radio-labeled amino acids and biological metabolites for medical research. Calvin began building the lab by recruiting strong chemists from across the country. He then brought in Andrew Benson, who had worked with Ruben and Kamen on photosynthesis and carbon-14, to lead that part of the lab. At the time, the prevailing theory held that producing sugars and other reduced carbon compounds was a “light” reaction, a theory that had not yet been disproven.
Quick Facts
- Birth name
- Melvin Ellis Calvin
- Born
- April 8, 1911
- Birthplace
- St. Paul, Minnesota, U.S.
- Died
- 8 January 1997
- Place of death
- Berkeley, California, U.S.
- Workplaces
- University of Manchester
- University of California, Berkeley
- Berkeley Radiation Laboratory
- Science Advisory Committee
- Education
- Michigan College of Mining and Technology; University of Minnesota
- Doctoral students
- Cyril Ponnamperuma
Facts from the source article.
Lore & Background
Calvin was born in St. Paul, Minnesota, to Jewish immigrants from the Russian Empire. He earned a B.S. in Chemistry from Michigan College of Mining and Technology and a PhD from the University of Minnesota. After a postdoc with Michael Polanyi at the University of Manchester, he joined UC Berkeley. He married Marie Genevieve Jemtegaard in 1942; they had two daughters and a son. He served as president of the American Chemical Society, the American Society of Plant Physiology, and the Pacific Division of the American Association for the Advancement of Science, and chaired the Committee on Science and Public Policy for the National Academy of Sciences.
Reader's Guide
Calvin's key discovery was the Calvin–Benson–Bassham cycle, mapping carbon's path in photosynthesis using carbon-14. He led the Bio-Organic Chemistry group at Lawrence Radiation Laboratory, later directing the Laboratory of Chemical Biodynamics (the 'Roundhouse'). His later research included oil-producing plants as renewable energy and chemical evolution of life, publishing a book on the subject in 1969.
Did You Know?
- He was the first non-Berkeley graduate hired by the chemistry department in over 25 years.
- Calvin's team used paper chromatography to identify phosphoglyceric acid as the first product of CO2 fixation.
From a Grocery Store to the Laboratory Bench
Melvin Ellis Calvin was born on April 8, 1911, in St. Paul, Minnesota, to Elias Calvin and Rose Herwitz, Jewish immigrants from the Russian Empire—land that today comprises Lithuania and Georgia. The family later settled in Detroit, Michigan, where his parents ran a grocery store. Young Calvin was a frequent sight among the shelves, examining every product with a curiosity that foreshadowed a lifetime of scientific inquiry. He graduated from Central High School in 1928 and then enrolled at the Michigan College of Mining and Technology, now Michigan Technological University, where he received the school's first-ever Bachelor of Science in Chemistry. His doctoral work at the University of Minnesota, completed in 1935 under George Glocker, focused on the electron affinity of halogens. A two-year postdoctoral period at the University of Manchester, in Michael Polanyi's laboratory, deepened his understanding of organic molecular structure and behavior. In 1942 he married Marie Genevieve Jemtegaard; together they raised three children—daughters Elin and Karole, and son Noel.
Tracing Carbon's Journey Through the Leaf
The work that earned Calvin the 1961 Nobel Prize in Chemistry grew from difficult circumstances. Sam Ruben and Martin Kamen had pioneered research with the long-lived radioactive isotope carbon-14, but the project was derailed when Ruben died in a laboratory accident and Kamen faced security troubles with the FBI and the Department of State. Ernest Lawrence, director of the Radiation Laboratory, and Wendell Latimer, Dean of Chemistry and Chemical Engineering, nonetheless recruited Calvin in 1945 to carry the work forward. Calvin assembled a team of strong chemists and brought in Andrew Benson, who had previously collaborated with Ruben and Kamen on photosynthesis, to lead that line of inquiry. The prevailing assumption held that sugar production was purely a light-driven reaction. Benson challenged this by isolating the product of dark carbon dioxide fixation, crystallizing radioactive succinic acid, and showing that when algae exposed to light without carbon dioxide were quickly transferred to a dark flask containing it, radioactive sucrose still formed at the same rate as under continuous illumination. Using carbon-14 as a tracer, Calvin, Benson, and James Bassham mapped the complete pathway by which atmospheric carbon dioxide becomes carbohydrates and other organic compounds. It became known as the Calvin–Benson–Bassham Cycle.
The Roundhouse and a Philosophy of Collaboration
Calvin's influence at UC Berkeley extended far beyond a single discovery. In 1947 he was elevated to Professor of Chemistry and director of the Bio-Organic Chemistry group within the Lawrence Radiation Laboratory, and in 1963 he added the title Professor of Molecular Biology. He went on to found and direct the Laboratory of Chemical Biodynamics, affectionately called the Roundhouse, while simultaneously serving as Associate Director of the Berkeley Radiation Laboratory. The Roundhouse's circular architecture was no accident; Calvin designed it to break down the barriers between disciplines and to make open scientific discussion a natural part of daily life. He regularly brought in postdoctoral researchers and guest scientists from around the world, convinced that the richest ideas emerged where different fields of knowledge intersected. His management style became legendary. Students and staff described a community in which they felt genuinely empowered to reach their full potential, and many creative scientific organizations that followed are said to model their collaborative culture on the example he set. Though the world knew him as Mr. Photosynthesis, his organizational genius touched every corner of the scientific community he influenced. He remained active in research until his retirement in 1980.
Beyond the Cycle: Later Work and Lasting Legacy
Calvin's career at the University of California, Berkeley, spanned roughly five decades, a tenure that began when Joel Hildebrand, director of the UC Radiation Laboratory, invited him to join the faculty during a visit to the University of Manchester. Hildebrand urged him to push forward in radioactive carbon research, declaring that now was the time. Calvin became the first non-Berkeley graduate hired by the chemistry department in more than twenty-five years. His early work at Berkeley built directly on the 1940 discoveries of Martin Kamen and Sam Ruben regarding long-lived radioactive carbon-14. In his final years of active research, Calvin turned his attention to oil-producing plants as renewable energy sources. He also devoted many years to investigating the chemical evolution of life, a line of inquiry that culminated in a book published in 1969. The 1961 Nobel Prize in Chemistry, awarded for his research on the carbon dioxide assimilation in plants, recognized not just a single mechanism but a way of thinking about how living systems capture and transform energy. Calvin died on January 8, 1997, leaving behind a cycle that bears his name and a model of scientific community that continues to inspire.
Frequently Asked Questions
Who is Melvin Calvin?
Melvin Ellis Calvin was an American biochemist born in St. Paul, Minnesota in 1911, best remembered for tracing how carbon dioxide gets fixed into organic molecules during photosynthesis. He spent the bulk of his five-decade career at UC Berkeley.
What is the Calvin cycle and who discovered it?
The Calvin cycle—also called the Calvin–Benson–Bassham cycle—is the set of reactions by which plants incorporate CO₂ into sugars, and it was mapped out by Calvin together with Andrew Benson and James Bassham. This work became the defining achievement of Calvin's scientific career.
Why did Melvin Calvin win the Nobel Prize in Chemistry?
Calvin received the 1961 Nobel Prize in Chemistry for his research on how carbon dioxide is assimilated in photosynthetic organisms. The prize recognized the detailed carbon-fixation pathway he and his collaborators had charted.
Where did Melvin Calvin spend most of his career?
For roughly fifty years, Calvin was based at the University of California, Berkeley, where he conducted the bulk of his photosynthesis research. That single-institution tenure is a notable feature of his professional life.
What field of science did Melvin Calvin work in?
Calvin's work sat at the intersection of chemistry and biology, placing him squarely in the biochemistry field. His specific focus was on the molecular mechanics of carbon fixation in green plants.
More in Chemists & Biochemists
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced