The publication of Polynomial Response Maps in 1979 marked a significant phase in the development of deterministic finite-dimensional systems theory. Eduardo D. Sontag, born in 1951 in Buenos Aires, Argentina, has spent his career bridging the gap between pure mathematics and its applications in biology, immunology, computer science, and complex dynamical control systems.
Academic Foundation and Early Career
Sontag completed his Licenciado degree at the University of Buenos Aires in 1972. He moved to the United States for his doctoral studies, earning his Ph.D. in Mathematics at the University of Florida between 1972 and 1977. His dissertation work was supervised by Rudolf Kálmán at the Center for Mathematical Systems Theory. Following his graduation, he joined Rutgers University–New Brunswick, where he served on the faculty from 1977 until 2017. During his tenure at Rutgers, he held titles including Distinguished Professor of Mathematics and contributed to departments ranging from computer science to the Rutgers Cancer Institute of New Jersey.
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His research in control theory introduced the concept of input-to-state stability, an essential stability framework for nonlinear systems, as well as the implementation of control-Lyapunov functions. In the domain of theoretical computer science, Sontag established early results concerning computational complexity in nonlinear controllability. Working with Hava Siegelmann, he proposed a novel approach to analog computation and super-Turing computing. His systems biology research includes defining the concept of input/output monotone systems, a development produced alongside David Angeli.
Institutional Appointments and Professional Service
In January 2018, Sontag joined Northeastern University as a University Distinguished Professor, holding appointments in the Department of Electrical and Computer Engineering and the Department of BioEngineering. He maintains affiliate status within the Department of Mathematics and the Department of Chemical Engineering. Throughout his career, he has served on numerous editorial boards, including the Journal of Computer and Systems Sciences, and co-founded the publication Mathematics of Control, Signals, and Systems.
Honors and Recognition
Sontag's professional distinctions include his election as a Fellow of the American Mathematical Society in 2013 and a Fellow of the Society for Industrial and Applied Mathematics in 2009. In 2022, he received the Richard E. Bellman Control Heritage Award, recognized as the primary honor within the field of control theory and engineering in the United States. His body of work encompasses several hundred papers and three books, including the second edition of Mathematical Control Theory: Deterministic Finite Dimensional Systems, released in 1998.
Fast facts
- Born: 1951, Buenos Aires, Argentina
- Undergraduate Education: University of Buenos Aires, 1972
- Doctoral Education: University of Florida, 1972–1977
- Academic Tenure: Rutgers University–New Brunswick, 1977–2017
- Current Employer: Northeastern University, 2018–present
- 2022 Award: Richard E. Bellman Control Heritage Award
- AMS Fellow: 2013
- SIAM Fellow: 2009
Questions readers ask
What is the primary focus of Eduardo Sontag's mathematical research?
His work centers on control theory, dynamical systems, systems biology, immunology, neural networks, and theoretical computer science.
With which universities has Eduardo Sontag held professional faculty appointments?
He has been affiliated with Rutgers University–New Brunswick and Northeastern University.
Achievements
- Held posts at Northeastern University and Rutgers University–New Brunswick
