James A. Yorke  
   Coined the term "chaos".
   http://www-chaos.umd.edu/~yorke/

Mitchell Feigenbaum  
   Pioneered bifurcations in the mid 70s and for whom the Feigenbaum tree is named.
   http://www.rockefeller.edu/labheads/feigenbaum/feigenbaum.html

Dynamical Systems List  
   A search form for a list of people working in the area.
   http://www.math.sunysb.edu/dynamics/people/search-people.html

Who Is Who Handbook of Nonlinear Dynamics  
   Searchable list of people working in nonlinear dynamics.
   http://wiw.ip-technik.de/

Marsden, Jerrold  
   Division of Engineering and Applied Science at the California Institute of Technology. Specializes in control and dynamical systems. Includes course notes, published works, post doctorate education and conferences attended.
   http://www.cds.caltech.edu/~marsden/