Todd A. Ell is an Engineering Fellow at UTC Aerospace Systems, Burnsville, MN, USA. He is also a Visiting Fellow at the University of Essex, Colchester, UK. His interests include the study and application of hypercomplex algebras to dynamic systems analysis.
Nicolas Le Bihan is currently a Chargé de Recherche at the CNRS working in the Department of Images & Signals (DIS) at the GIPSA-Lab in Grenoble, France. His research interests include polarized signal processing, statistical signal processing on groups and manifolds, geometric (Berry) phases, random processes on non-commutative algebraic structures and applications in physics and geophysics.
Stephen J. Sangwine is a Senior Lecturer with the School of Computer Science and Electronic Engineering, University of Essex, Colchester, UK. His interests include linear vector filtering and transforms of vector signals and images, color image processing, and digital hardware design.