John Cockcroft begins researches on the acceleration of protons by high voltages with Ernest T.S. Walton in 1928. They discover the transmutation of lithium into helium and other elements by high energy protons in 1932. This is known as splitting the atom. They even produce radioactivity by protons in 1933.

After his education at Metropolitan Vickers Electrical Company, John Cockcroft studies mathematics at St John´s College, Cambridge. He graduates in 1924.

John Cockcroft returns to England in 1946, where he becomes the first Director of the Atomic Energy Research Establishment (AERE) in Harwell. John Cockcroft is knighted in 1948. He becomes scientific research member of the UK Atomic Energy Authority from 1954 until 1959.

John Cockcroft, along with Ernest T.S. Walton, is awarded the 1951 Nobel Prize in Physics for their pioneering work on the transmutation of atomic nucleus by artificially accelerated atomic particles.

John Cockcroft attends the Todmorden Secondary School and graduates in 1914.

John Cockcroft becomes an Assistant Director of Scientific Research in the Ministry of Supply, where he works on radar technology. In addition he is appointed Head of the Air Defence Research and Development Establishment in 1940. He moves to Canada to lead the Canadian Atomic Energy Project and becomes the Director of the Montreal and Chalk River Laboratories in 1944.

John Cockcroft and Eunice Elizabeth Crabtree get married in 1925. They have four daughters and two sons.

John Cockcroft received many honorary doctorates, became fellow and honorary member of a number of societies and earned multitudinous honours and awards in his life. He dies on 18. September 1967.

John Cockcroft starts researches under Ernest Rutherford in the Cavendish Laboratory in 1924.

John Cockcroft starts studying mathematics at Manchester University in 1914. During the First World War he serves in the Royal Field Artillery from 1915 till 1918. He returns to Manchester College of Technology to study electrical engineering from 1919 till 1920.

John Cockcroft becomes a lecturer of Natural Philosophy at St John´s College.

Sir John Douglas Cockcroft is born as one of four sons to his parents Annie Maude Fielden and John Arthur Cockcroft in Todmorden, England.

John Cockcroft becomes the first Master of Churchill College at Cambridge University.