Ares J. Rosakis

Ares J. Rosakis graduated from Athens College, a Greek-American secondary school in Athens, in June 1975. He subsequently moved to the United Kingdom to study engineering science at the University of Oxford, where he earned his bachelor’s degree in 1978 and his Master of Arts degree in 1986. He then continued his graduate studies at Brown University, receiving a Sc.M. in 1980 and a Ph.D. in engineering in 1982, specializing in solid mechanics and structures with a minor in materials science.

In 1982, Rosakis joined the California Institute of Technology (Caltech) as an assistant professor, becoming an associate professor in 1988 and a full professor in 1993. In 2004, he was appointed the Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering. From 2004 to 2009, he served as director of Caltech’s Graduate Aerospace Laboratories (GALCIT), where he oversaw the development of new research and educational programs and strengthened collaborations with academic, government, and industrial partners. In 2005, he was a Distinguished Visiting Professor in the Department of Terre, Atmosphère et Océan at the École Normale Supérieure in Paris, and in 2008 he served as the Astor Visiting Professor at the University of Oxford.

From 2009 to 2015, Rosakis served as chair of Caltech’s Division of Engineering and Applied Science (EAS). During his tenure, he oversaw the restructuring and expansion of the division, including the establishment of new academic and research initiatives in medical engineering, energy and sustainability, autonomous systems, and space solar power. He also promoted international academic partnerships and collaborations with institutions including the Indian Space Research Organization, the University of Seville, and École Polytechnique. In 2013, he was appointed the inaugural Otis Booth Leadership Chair of the Division of Engineering and Applied Science.

Rosakis’s career has been distinguished by major contributions to experimental mechanics, dynamic fracture, materials failure, and earthquake seismology, as well as by leadership in engineering education and research. He has been elected to several national and international scientific academies, including the U.S. National Academy of Engineering in 2011, the National Academy of Sciences in 2016, and the Academy of Athens. In 2024, he was elected a Foreign Member of the Royal Society, the United Kingdom’s national academy of sciences and one of the world’s oldest continuously operating scientific academies. He was formally inducted into the Royal Society on July 10, 2026. The Royal Society recognized his interdisciplinary contributions to dynamic fracture and impact mechanics, including his development of high-speed optical and infrared diagnostic techniques, his experimental discoveries concerning intersonic fracture and supershear rupture, and his pioneering use of laboratory earthquakes to investigate earthquake
physics. His election made him the first Caltech professor of mechanics and mechanical engineering to be
elected to the Royal Society.

Rosakis has received numerous national and international honors for his contributions to mechanics, materials science, aerospace engineering, experimental methods, and earthquake science. His distinctions recognize pioneering research on dynamic fracture and the failure of materials and structures, the development of high-speed optical and infrared diagnostic techniques, and experimental investigations of earthquake rupture and friction. Among his most significant honors are election to the U.S. National Academies of Sciences and Engineering, the American Academy of Arts and Sciences, the Academy of Athens, and several European academies, as well as the Theodore von Kármán Medal, the Timoshenko Medal, the Horace Mann Medal, and the Commandeur dans l’Ordre des Palmes Académiques of France. In 2024, Rosakis was elected a Foreign Member of the Royal Society, the United Kingdom’s national academy of sciences, and was formally inducted in 2026.

2026

Inducted as a Foreign Member to the Royal Society[1] (FRS) for his interdisciplinary contributions to experimental mechanics and earthquake science, including the development of high-speed optical and infrared diagnostic methods for studying dynamic fracture, shear localization, and impact phenomena across multiple length and time scales. These methods enabled experimental discoveries of intersonic fracture and delamination in composite materials and supershear rupture along frictional geological faults. The Royal Society also cited his pioneering development of laboratory earthquakes and the use of scaling principles to investigate earthquake rupture processes and resolve longstanding problems in earthquake science. His 2024 election was the first election to the Royal Society of a Caltech professor of mechanics and mechanical engineering.

2023

Elected full member of the Academy of Athens [2] (AA) to the chair of “Science of Modern Materials: Macro/Micro/Nano-structural Strength, Fatigue.” The chair reflects the broad scope of his research in the mechanics and reliability of materials, including static and dynamic fracture, structural strength across multiple length scales, high-speed impact phenomena, and the mechanics of earthquake fault rupture. His work has combined experimental, theoretical, and numerical approaches to problems ranging from the behavior of engineered materials at micro- and nano-scales to large-scale seismic rupture processes. His election as an Ordinary Member followed his earlier election as a Corresponding Member of the Academy in 2013.

Rosakis is the author of more than 260 works on quasi-static and dynamic failure of metals, composites, interfaces and micro-electronic structures, with emphasis on the use of high speed visible and IR diagnostics and laser interferometry for the study of thermal fatigue, catastrophic failure and dynamic localization. His early work includes the study of dynamic, ductile failure of structural metals by using high speed photography, the real-time measurement of temperature fields at the vicinity of dynamically growing cracks and adiabatic shear bands and the development of a variety of optical and dynamic infrared diagnostic methods. He and his coworkers invented Coherent Gradient Sensing, CGS, interferometry, a method sensitive to gradients of optical path gradients which has been used in both fracture mechanics and thin film stress and reliability measurements at the wafer level. Other interests include dynamic fragmentation; shear dominated intersonic rupture of inhomogeneous materials and composites, rupture mechanics of crustal earthquakes, shielding of spacecraft from hypervelocity micrometeoroid impact threats, the reliability of thin films and wafer level optical metrology. Rosakis holds thirteen US patents on thin-film stress measurement and in situ wafer level metrology as well as on high speed infrared thermography.

In the late eighties, Rosakis introduced the concept of "laboratory earthquakes"^[29] and since then his research interests have included on the mechanics of seismology, the physics of dynamic shear rupture and frictional sliding and on laboratory seismology. The goal of this body of work is to create, in a controlled and repeatable environment, surrogate laboratory earthquake scenarios mimicking various dynamic shear rupture process occurring in natural earthquake events. Such, highly instrumented, experiments are used to observe new physical phenomena and to also create benchmark comparisons with existing analysis and field observations. The experiments use high-speed photography, full-field photoelasticity, digital image correlation (DIC) and laser velocimetry as diagnostics. The fault systems are simulated using two photoelastic plates held together in frictional contact. The far field tectonic loading is simulated by pre-compression while the triggering of dynamic rupture (spontaneous nucleation) is achieved by suddenly dropping the normal stress in a small region along the interface. The frictional interface (fault) forms various angles with the compression axis to provide the shear driving force necessary for continued rupturing. Rosakis and his co-workers, investigate the characteristics of rupture, such as rupture speed, rupture mode, associated ground motion under various conditions such as tectonic
load, interface complexity and roughness.

Both homogeneous and bimaterial interfaces (abutted by various elastic and damaged media) are investigated. Rosakis and his coworkers have been credited with the experimental discovery of the "intersonic" or "supershear rupture" phenomenon. They also have investigated this new phenomenon in various engineering and geophysical settings involving shear dominated rupture in the presence of weak interfaces or faults. Their experimental discoveries of supershear rupture has refocused the attention of the geophysics community to the study of supershear earthquakes.

Another recent research interest for Rosakis is hypervelocity impact. Hypervelocity impact is a rising concern in spacecraft missions where man-made debris in low Earth orbit (LEO) and meteoroids are capable of compromising or depleting the structural integrity of spacecraft. To address these concerns, the goal of current research is to experimentally investigate the underlying mechanisms responsible for deformation and damage evolution during hypervelocity impact utilizing Caltech/JPL's Small Particle Hypervelocity Impact Range (SPHIR) facility. By combining high speed photography, optical, spectroscopic and infrared techniques, including Coherent Gradient Sensing (CGS) interferometry, the dynamic perforation behavior involving crater morphology, debris and ejecta formation and solid/fluid/plasma transitions and interactions have been examined.

2009 – 2015, as EAS Division Chair

• For three years in a row Engineering and Technology at Caltech was ranked #1 by the Times Higher Education World University Ranking (Thomson Reuters) for 2010–2011, 2011–2012,^[30] and 2012–2013.
• Presided over the structural re-organization of the Division of Engineering and Applied Science (EAS) at Caltech.
• Replaced the amorphous degree option structure with seven EAS departments and presided over their administrative restructuring.
• Introduced a system of multiple fundraising advisory councils, composed of Caltech alumni and Institute trustees, corresponding to each new department.
• Established the Center for Technology and Management Education (CTME) which provides executive training, courses and certificate programs to international companies and government agencies.
• Involved in the establishment and oversight of the Resnick Energy Sustainability Institute which aims to foster transformational advances in energy science and technology through research, education, and communication.
• Member of the oversight board for the Joint Center for Artificial Photosynthesis (JCAP) with the mission to keep the United States at the forefront of solar fuel research.
• Oversaw the fundraising and renovation of the Jorgensen Laboratory to serve as the new home for two of Caltech's key energy and sustainability research efforts: the Resnick Institute and the Joint Center for Artificial Photosynthesis.
• Presided over, along with the Chair of the Division of Geology and Planetary Sciences, the establishment of the interdisciplinary Terrestrial Hazard Observation and Reporting (THOR) Center.
• Established a graduate student exchange program between the Caltech's Division of Engineering and Applied Science and Institut Supérieur de l'Aéronautique et de l'Espace, located in Toulouse, France.
• Appointed by the President of Ecuador as a founding member of the Board of Trustees of Yachay International University.
• Created a partnership program with the Indian Space Research Organization (ISRO) and established the “Satish Dhawan” endowed fellowship sponsored by ISRO and the Government of India. Also created the “Abdul Kalam” prize in Aerospace.^[31]
• Established the Charles M. Vest Engineering Grand Challenges Scholarship at Caltech for International collaboration (endorsed by NAE and RAE).
• Founded the new Department of Medical Engineering at Caltech within the Division of Engineering and Applied Science.
• Facilitated the establishment of the Caltech - Northrop Grumman Space Solar Power Initiative (SSPI).
• Spearheaded the establishment of the Foster and Coco Stanback Center for Autonomous Systems and Technology (CAST).

2004 – 2009, as Director of GALCIT

• Led the initiative to revitalize the Graduate Aerospace Laboratories (GALCIT). Caltech was ranked #1 or #2 in Aerospace Engineering for the last six years by the U.S. News & World Report.^[32]
• Five new faculty members hired between 2005 and 2007, increased the size of GALCIT faculty by 40%.
• Established Masters Program in Space Engineering, in collaboration with the Jet Propulsion Laboratory (JPL); initiated follow-on PhD program in Space Engineering; guaranteed the long-term viability of these programs through new fundraising for lectureships and fellowships.
• Established a two-year dual masters' program between GALCIT and École Polytechnique in France. The program received the 2010 Andrew Heiskell Award for Innovation in International Education from the Institute of International Education in New York.
• Established a Master's of PhD exchange program with the Government of Andalucía and the University of Seville.
• Oversaw extensive fundraising and renovation of the historic Guggenheim Laboratory following removal of 10-foot wind tunnel. Four labs built, the Laboratory for Large Space Structures, the Allen Puckett Laboratory of Computational Fluid Mechanics, the Gordon Cann Laboratory of Experimental Innovation, and the Joseph Charyk Center for Bio-Inspired Design; Kármán Conference room renovated and GALCIT Archives created (made possible by Robert Herzog); and extensive new classroom, conference, office, and social spaces created.
• Established the GALCIT Director's advisory board to extend the fundraising reach of GALCIT.
• Contributed to the establishment of the Keck Institute for Space Studies at Caltech and JPL.
• Led systematic effort to formally involve GALCIT and EAS faculty in joint research projects with JPL, the newly established Keck Institute for Space Studies, and the aerospace industry.
• Co-organized (with JPL and Northrop Grumman) an international conference to celebrate the 50th Anniversary of Space Exploration.
• Incorporated the Aerospace Historical Society (AHS) into GALCIT and became its president. Among other outreach activities the Society is annually responsible for awarding the International von Kármán Wings Award.

• 2026 - Elected foreign fellow of the Royal Society.^[33](FRS)
• 2023 - Elected full member of the Academy of Athens.^[34](AA)
• 2020 - Elected member of the European Academy of Sciences.^[35](EurASc)
• 2016 - Elected member of US National Academy of Sciences.^[36](NAS)
• 2014 - Elected member of Academia Europaea.^[37](AE)
• 2013 - Elected foreign fellow of Indian National Academy of Engineering.^[38](INAE)
• 2013 - Elected member of European Academy of Sciences and Arts.^[39](Academia Scientiarum et Artium Europaea)
• 2013 - Elected corresponding Member of Academy of Athens.^[40](National Academy of Greece)
• 2011 - Elected member of US National Academy of Engineering.^[41] (NAE)
• 2009 - Elected fellow of American Academy of Arts and Sciences.^[42](AAA&S)

• "Ares J. Rosakis | California Institute of Technology" rosakis.caltech.edu. Retrieved 2012-01-24.
• http://www.eas.caltech.edu/people/3177/profile
• Curriculum Vitae of Ares Rosakis