Robert L. Devaney


Robert Luke Devaney was an American mathematician. He was the Feld Family Professor of Teaching Excellence at Boston University, and served as the president of the Mathematical Association of America from 2013 to 2015. His research involves dynamical systems and fractals.

Background

Devaney was born in Lawrence, Massachusetts, on April 9, 1948. He grew up in Methuen, Massachusetts.
He graduated in 1969 from the College of the Holy Cross,
and earned his Ph.D. in 1973 from the University of California, Berkeley, under the supervision of Stephen Smale. From 1974 to 1976, he was a postdoctoral research fellow at Northwestern University. Before joining the faculty at Boston University, he taught at Tufts University, Northwestern University, and the University of Maryland, College Park.
Devaney died on November 16, 2025, at the age of 77.

Mathematical activities

Devaney is known for formulating a simple and widely used definition of chaotic systems, one that does not need advanced concepts such as measure theory. In his 1989 book An Introduction to Chaotic Dynamical Systems, Devaney defined a system to be chaotic if it has sensitive dependence on initial conditions, it is topologically transitive, and its periodic orbits form a dense set. Later, it was observed that this definition is redundant: sensitive dependence on initial conditions follows automatically as a mathematical consequence of the other two properties.
Devaney hairs, a fractal structure in certain Julia sets, are named after Devaney, who was the first to investigate them.
As well as research and teaching in mathematics, Devaney's mathematical activities have included organizing one-day immersion programs in mathematics for thousands of Boston-area high school students, and consulting on the mathematics behind media productions including the 2008 film 21 and the 1993 play Arcadia. He was president of the Mathematical Association of America from 2013 to 2015.

Awards and honors

In 1995, Devaney won the Deborah and Franklin Tepper Haimo Award for Distinguished University Teaching of the Mathematical Association of America.
In 2002, Devaney won the National Science Foundation Director's Award for Distinguished Teaching Scholars.
He was named the inaugural Feld Professor in 2010.
In 2008, a conference in honor of Devaney's 60th birthday was held in Tossa de Mar, Spain. The papers from the conference were published in a special issue of the Journal of Difference Equations and Applications in 2010, also honoring Devaney.
In 2012, he became one of the inaugurals fellows of the American Mathematical Society.

Selected publications

;Books
Devaney is the author of books on fractals and dynamical systems including:
  • An Introduction to Chaotic Dynamical Systems
  • The Science of Fractal Images
  • Chaos, Fractals, and Dynamics: Computer Experiments in Mathematics
  • A First Course in Chaotic Dynamical Systems: Theory and Experiment
  • Fractals: A Tool Kit of Dynamics Activities
  • Iteration: A Tool Kit of Dynamics Activities
  • Chaos: A Tool Kit of Dynamics Activities
  • The Mandelbrot and Julia Sets: A Tool Kit of Dynamics Activities
  • Differential Equations
  • Differential Equations, Dynamical Systems, and an Introduction to Chaos
;Research papers
Some of the more highly cited of Devaney's research publications include:
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