Clifford Martin Will (born 1946) is a Canadian-born theoretical physicist noted for his contributions to general relativity.^[1]

Will was born in Hamilton, Ontario. In 1968, he earned a B.Sc. from McMaster University. At Caltech, he studied under Kip Thorne, earning his Ph.D. in 1971.^[2][3] He has taught at the University of Chicago and Stanford University, and in 1981 joined the faculty of Washington University in St. Louis. In 2012, he moved to a faculty position at the University of Florida.^[1]

Will's theoretical work has centered on post-Newtonian expansions of approximate solutions to the Einstein field equation, a notoriously difficult area which forms the theoretical underpinnings essential for such achievements as the indirect verification by Russell Hulse and Joseph Taylor of the existence of gravitational radiation from observations of a binary pulsar.^[1]

Will's book reviewing experimental tests of general relativity is widely regarded as the essential resource for research in this area; his popular book on the same subject was listed by The New York Times as one of the 200 best books published in 1986.^[1]

Will was a Guggenheim Fellow for the academic year 1996–1997.^[4] From 2009 to 2018, Will was the editor-in-chief of IOP Publishing's journal Classical and Quantum Gravity.^[1]

He was elected a Fellow of the American Physical Society in 1989 ^[5] and elected to the National Academy of Sciences in 2007.^[1]

In 2019, Will received the Albert Einstein Medal, awarded each year since 1979 by the Albert Einstein Society in Bern, Switzerland, for his "important contributions to General Relativity, in particular including the Post-Newtonian expansions of approximate solutions of the Einstein field equations and their confrontation with experiments."^[6]

According to the NASA ADS database, the h-index of Professor Will is 57.

• Will, Clifford M. (2014). "The Confrontation between General Relativity and Experiment". Living Reviews in Relativity. 17 (1): 4. arXiv:1403.7377. Bibcode:2014LRR....17....4W. doi:10.12942/lrr-2014-4. PMC 5255900. PMID 28179848. S2CID 15329710.
• Will, Clifford M. (1981). Theory and experiment in gravitational physics. Cambridge: Cambridge University Press. ISBN 0-521-23237-6.
• Will, Clifford M. (1993). Was Einstein right?: putting general relativity to the test. New York: Basic Books. ISBN 0-465-09086-9. (original publication date 1986)
• Will, Clifford M.; Poisson, Eric (2014). Gravity: Newtonian, Post-Newtonian, Relativistic. Cambridge University Press. ISBN 978-1107032866.
• Will, Clifford M. (2018). Theory and experiment in gravitational physics. 2nd Edition. Cambridge: Cambridge University Press. ISBN 978-1-107-11744-0.
• Will, Clifford M.; Yunes, Nicolás (2020). Is Einstein Still Right? Black holes, gravitational waves and the quest to verify Einstein's greatest creation. Oxford: Oxford University Press. ISBN 9780198842125.