Dorothy Crowfoot Hodgkin spent decades finding ways to make the invisible legible. Using X-ray crystallography, she worked out the arrangements of atoms in molecules central to medicine and biology, including penicillin, vitamin B12 and insulin. The task demanded new methods as well as patience: when she began investigating insulin, the available techniques could not yet resolve a molecule of its complexity. Her work at Oxford helped establish protein crystallography as a powerful means of understanding how biological molecules are built.
A childhood between countries
Dorothy Mary Crowfoot was born in Cairo on 12 May 1910, the eldest of four daughters. Her parents, John Winter Crowfoot and Grace Mary Hood, worked in North Africa and the Middle East; her father served in education and archaeology, while her mother was a botanist with an interest in ancient textiles. The family spent part of each year in England. In 1914, Dorothy and her younger sisters remained with their grandparents near Worthing when their mother returned to Egypt.
Her mother encouraged Dorothy’s early interest in crystals. At ten, she was already curious about their forms; a few years later she and her sister examined pebbles with a portable mineral-analysis kit. A book on X-ray crystallography, given to her by her mother on her sixteenth birthday, helped direct that curiosity towards a scientific career.
At Sir John Leman Grammar School in Beccles, she was one of only two girls permitted to study chemistry. Latin was required for entry to Oxford, although it was not part of her school education; the headmaster gave her extra tuition so she could sit the entrance examination. She entered Somerville College in 1928, aged 18, and graduated in 1932 with first-class honours. In 1933, she received a research fellowship from Somerville.
Learning to see molecules
After Oxford, Crowfoot began doctoral research at Newnham College, Cambridge, under the supervision of John Desmond Bernal. Their work introduced her to the possibility that X-ray diffraction could reveal the structure of biological substances. They investigated pepsin, a protein enzyme; Crowfoot later emphasised Bernal’s part in the work, including taking the first photographs and offering important insights. She received her PhD in 1937 for research on X-ray crystallography and the chemistry of sterols.
That year she married historian Thomas Lionel Hodgkin. She continued to publish as Dorothy Crowfoot for a time, later adopting the name Dorothy Crowfoot Hodgkin. In 1936, Somerville appointed her its first fellow and tutor in chemistry. She held the post until 1977, building a research career alongside her teaching. In 1960 she became the Royal Society’s Wolfson Research Professor, a position that supported her salary, research expenses and assistants until 1970.
Her work was not simply a matter of interpreting pictures. Researchers had to grow crystals, collect diffraction data and develop ways to calculate the positions of atoms. The size and complexity of biological molecules made those calculations especially demanding. Hodgkin’s progress depended on sustained experimental work and on improvements in the tools available to her and her collaborators.
Penicillin, vitamin B12 and insulin
In 1945, Hodgkin and her colleagues, including Barbara Low, worked out the structure of penicillin. Their findings showed that the molecule contained a β-lactam ring, contrary to scientific opinion at the time. The result was published in 1949. The work became an important demonstration of what crystallography could establish about a complex natural product; it is more precise to describe it as confirming the structure than as originating the discovery of penicillin itself.
Hodgkin first encountered vitamin B12 in 1948 and prepared crystals for analysis. The molecule was unusually complex, and its structure was largely unknown. Evidence from the crystals, including their colour changes in different orientations, helped her identify a ring structure; X-ray analysis then enabled her to establish the arrangement more fully. Her team’s structure was published in 1955 and 1956. The achievement brought the 1964 Nobel Prize in Chemistry: Hodgkin was the third woman to receive the chemistry award.
Insulin presented a longer challenge. In 1934, Robert Robinson gave Hodgkin a small sample of crystalline insulin. The hormone interested her, but X-ray crystallography was not then capable of resolving its structure. It took 35 years from her first photograph of an insulin crystal for the methods and computing techniques to reach the point where she and her team could determine the structure, in 1969. The work helped make the molecule’s structure available for further research, including work on insulin production and the development of modified forms.
Hodgkin’s research extended beyond these best-known examples. In 1945, she and C. H. Carlisle published the first three-dimensional structure of a steroid, cholesteryl iodide. She also maintained scientific relationships with colleagues abroad, including crystallographers in the Soviet Union, India and China. Her links with Chinese researchers working on insulin continued through repeated visits over several decades.
Science, teaching and public life
Hodgkin’s work was recognised by election to the Royal Society in 1947 and by major honours including the Royal Medal in 1956, the Order of Merit in 1965 and the Copley Medal in 1976. She was the first woman to receive the Copley Medal. From 1970 to 1988 she served as Chancellor of the University of Bristol, and from 1976 to 1988 she was president of the Pugwash Conferences on Science and World Affairs, an organisation concerned with reducing the dangers of armed conflict.
Her influence also passed through the laboratory and lecture room. Among her students at Oxford was Margaret Roberts, later Margaret Thatcher. Hodgkin remained a lifelong Labour supporter, while Thatcher later displayed a portrait of her former teacher in Downing Street. The contrast between their politics did not prevent the younger woman from showing respect for Hodgkin’s teaching.
Hodgkin lived with rheumatoid arthritis from the age of 24. The condition caused pain and progressive changes to her hands and feet, at times making laboratory work difficult. She adapted equipment so she could continue using it, and remained scientifically active despite increasing disability. Her career also included family life: she and Thomas had three children. He died in 1982; Hodgkin died after a stroke on 29 July 1994 at his home in Ilmington, Warwickshire.
Why Dorothy Hodgkin deserves a place in British Legacy
Dorothy Hodgkin’s place in British scientific history rests first on what her crystallographic work made possible. By establishing the structures of penicillin and vitamin B12, she showed how X-ray methods could answer questions about complicated biological molecules. Her determination of insulin’s structure, after decades of technical development, extended that capacity to a molecule with direct importance in treating diabetes. These were not abstract exercises in pattern recognition: they supplied structural knowledge that other scientists could use to investigate how substances work and how they might be produced or altered.
Her British legacy is also rooted in the institutions where she taught and worked. At Somerville College and the University of Oxford, she sustained a long career in research and teaching, trained students and helped make structural chemistry a more capable discipline. Her example carries particular weight because she entered a school chemistry class as one of only two girls allowed to take the subject, then became a Nobel laureate and a leading figure in science. Her achievements do not need embellishment to make that contrast significant. The honours she received, including the Order of Merit and the Copley Medal, recognised both the scale of her scientific contribution and the barriers she crossed within British academic life. Hodgkin’s legacy endures in the methods she advanced, the knowledge her research opened to others, and the scientific community she helped build.
Sources
Dorothy Hodgkin — Wikipedia revision 1379081977
Adapted in part from Dorothy Hodgkin by Wikipedia contributors, under CC BY-SA 4.0. Text has been edited and combined with the existing article; this adapted text is shared under the same licence. Contributor history.
