From 1926 to 1928, he teaches in the physics department at New York University.

Robert Mulliken dies of heart failure at his daughter's home in Arlington, VA.

Mulliken receives his Bachelor’s degree in 1917 from the Massachusetts Institute of Technology.

He graduates from high school in 1913.

After the war, he enters the PhD program at the University of Chicago. He graduates in 1921, with a thesis about the separation of isotopes of mercury.

After that, he continues work on isotope separation in Chicago and learns spectroscopy. In 1925 and 1927, he travels to Europe, meeting outstanding spectroscopists and quantum theorists. Working with Friedrich Hund, he develops he molecular-orbital theory, in which electrons are assigned to states which extend over an entire molecule.

Robert Sanderson Mulliken is born in Newburyport, MA.

During World War I, he takes a position at the American University in Washington, D.C., making poison gas. Later he is drafted into the Army’s Chemical Warfare Service, where he continues on the same task, burning himself so badly that he spends months out of service.

Then he returns to the University of Chicago as an associate professor, being promoted to full professor in 1931. From 1942 to 1945, he directs the Information Office for the University’s Plutonium project. He continues his work on molecular structure and spectra, and retires in 1985.

He marries Mary Helen von Noé.

Robert Mulliken receives the 1966 Nobel Prize in Chemistry “for his fundamental work concerning chemical bonds and the electronic structure of molecules by the molecular orbital method”. This method can be applied to describe many different types of molecules.