Charles Royal Johnson
Born	(1948-01-28) January 28, 1948 (age 76) Elkhart, Indiana, United States
Nationality	American
Alma mater	Northwestern University, California Institute of Technology
Scientific career
Fields	Mathematics
Institutions	University of Maryland, College Park Clemson University College of William and Mary
Thesis	Matrices whose hermitian part is positive definite (1972)
Doctoral advisor	Olga Taussky Todd

Charles Royal Johnson (born January 28, 1948) is an American mathematician specializing in linear algebra. He is a Class of 1961 professor of mathematics at College of William and Mary.^[1] The books Matrix Analysis and Topics in Matrix Analysis, co-written by him with Roger Horn, are standard texts in advanced linear algebra.^[2][3][4]

Career

Charles R. Johnson received a B.A. with distinction in Mathematics and Economics from Northwestern University in 1969. In 1972, he received a Ph.D. in Mathematics and Economics from the California Institute of Technology, where he was advised by Olga Taussky Todd; his dissertation was entitled "Matrices whose Hermitian Part is Positive Definite".^[5] Johnson held various professorships over ten years at the University of Maryland, College Park starting in 1974. He was a professor at Clemson University from 1984 to 1987. In 1987, he became a professor of mathematics at the College of William and Mary, where he remains today.

Books

• Horn, Roger A.; Johnson, Charles R. (23 February 1990). Matrix Analysis. Cambridge University Press. ISBN 9780521386326. (1st edition 1985)
  • Matrix Analysis (2nd ed.). Cambridge University Press. 22 October 2012. ISBN 9781139788885. Horn, Roger A.; Johnson, Charles R. (2013). 2nd edition. ISBN 9780521548236; pbk((cite book)): CS1 maint: postscript (link)^[6]
• Horn, Roger A.; Johnson, Charles R. (24 June 1994). Topics in Matrix Analysis. Cambridge University Press. ISBN 9780521467131. (1st edition 1991)^[4]
• Fallat, Shaun M.; Johnson, Charles R. (11 April 2011). Totally Nonnegative Matrices. Princeton University Press. ISBN 9781400839018. Fallat, Shaun M.; Johnson, Charles R. (May 2011). cloth cover. ISBN 978-0-691-12157-4.^[7]
• Johnson, Charles R.; Saiago, Carlos M. (12 February 2018). Eigenvalues, Multiplicities and Graphs. Cambridge Tracts in Mathematics, 211. Cambridge University Press. ISBN 9781108547031.^[8]
• Johnson, Charles R.; Smith, Ronald L.; Tsatsomeros, Michael J. (October 2020). Matrix Positivity. Cambridge Tracts in Mathematics, 221. Cambridge University Press. ISBN 9781108478717.^[9]

as editor

• Johnson, Charles R., ed. (1990). Matrix Theory and Applications. Proceedings of Symposia in Applied Mathematics, volume 40. American Mathematical Society. ISBN 9780821801543; Lecture notes prepared for the AMS short course "Matrix Theory and Applications" held in Phoenix, Arizona, January 10–11, 1989((cite book)): CS1 maint: postscript (link)