lit a candle 1h ago75. Taught at the same place for 45 years. That's something.
Their story
John W. Rudnicki was an American engineer and educator whose work changed how scientists understand the way rocks and other geological materials deform, fracture and fail, especially when fluids are trapped inside them. He spent 45 years on the faculty of Northwestern University's McCormick School of Engineering, where he taught…
John W. Rudnicki was an American engineer and educator whose work changed how scientists understand the way rocks and other geological materials deform, fracture and fail, especially when fluids are trapped inside them. He spent 45 years on the faculty of Northwestern University's McCormick School of Engineering, where he taught mechanics to generations of undergraduate and graduate students and became one of the most respected figures in geomechanics and geophysics.
Rudnicki was born on August 12, 1951, in Huntington, West Virginia. He studied at Brown University from 1969, earning a bachelor of science in engineering mechanics in 1973, a master of science in solid mechanics in 1974 and a PhD in solid mechanics in 1977. His doctoral adviser was James R. Rice. Work from this period on the conditions for the localization of deformation in pressure-sensitive dilatant materials brought him a 1977 award for outstanding research in rock mechanics from the US National Committee for Rock Mechanics.
After his doctorate he worked as a research fellow and instructor in geophysics at the California Institute of Technology from 1977 to 1978. He then became an assistant professor of theoretical and applied mechanics at the University of Illinois Urbana-Champaign, serving there from 1978 to 1981.
In 1981 Rudnicki joined Northwestern as an associate professor of civil engineering and of theoretical and applied mechanics. He was promoted to full professor in both areas in 1990, and in 1991 he was also named a professor of mechanical engineering. His research focused on the inelastic behavior and failure of geomaterials: deformation instabilities in brittle rocks and granular media, the way those materials interact with pore fluids, and how deformation, diffusion and shear heating interact during earthquakes. The applications ranged from fault instability and the energy radiated by earthquakes to carbon dioxide storage in rock, energy storage and recovery, and the storage of toxic waste. His curiosity also reached unexpected places, including the mechanics of rat whiskers.
Rudnicki wrote more than 100 academic papers and published the textbook Fundamentals of Continuum Mechanics (Wiley, 2014). He served on the US Department of Energy's geosciences panel from 1997 to 2010 and chaired it from 2008 to 2010, and he was a consultant to the Southern California Earthquake Center from 2005 to 2010.
His honors included the Maurice A. Biot Medal (2006) for fundamental contributions to the mechanics of porous media and their application to rock mechanics and geophysics, Brown University's Engineering Alumni Medal (2008), the ASME Daniel C. Drucker Medal (2011), the Caterpillar Prize (2013) for a paper on permeability inside a dilatant shear band written with WaiChing Sun and Matthew Kuhn, and the Society of Engineering Science's Engineering Science Medal (2014), which was marked with a special symposium at Purdue University. He was elected a fellow of the American Rock Mechanics Association, the Engineering Mechanics Institute of the American Society of Civil Engineers, and the American Society of Mechanical Engineers.
Students knew him as a rigorous and enthusiastic teacher. His courses ranged from Engineering Analysis II, Mechanics of Materials and a Mechanics of Sports class for undergraduates to graduate courses in the mechanics of continua and inelastic constitutive relations for solids. Colleagues remembered his humor, kindness, candor and integrity as much as his science.
In spring 2026 Rudnicki moved to emeritus status, and Northwestern honored him with a symposium titled "A Celebration of John Rudnicki's Contributions to Geophysics and Geomechanics." He died on October 4, 2026, at the age of 75. Northwestern Engineering announced his death on October 6. The cause of death has not been made public. A visitation was scheduled for October 16, 2026, at Donnellan Family Funeral Services in Skokie, Illinois.
Biography adapted from Northwestern Engineering (Oct 6, 2026): https://www.mccormick.northwestern.edu/news/articles/2026/10/professor-emeritus-john-rudnicki-passes-away/ ; Wikipedia: https://en.wikipedia.org/wiki/John_Rudni. Wikipedia ↗
In their own words
“John Rudnicki leaves an extraordinary legacy in geomechanics and geophysics. His fundamental contributions transformed our understanding of deformation, failure, and strain localization in geomaterials.”
Gianluca Cusatis, professor of civil and environmental engineering, Northwestern Engineering, October 2026
“John was an exceptional mentor, a distinguished educator, and a giant in the field of mechanics.”
Sinan Keten, chair of mechanical engineering, Northwestern, October 2026
“Beyond his extraordinary scholarly accomplishments, I will remember John most for his humor, kindness, and integrity.”
Yu (Marco) Nie, Pepper Family Chair in Civil and Environmental Engineering, Northwestern, October 2026
“John has always been a gentleman, caring, and principled colleague who was passionate about helping students, either as professor or as their adviser.”
Manohar Kulkarni, Northwestern mechanical engineering, October 2026
Photos
1John Rudnicki in his Northwestern office
by People Forever
