Jonathan Leech


Professor of Mathematics, Emeritus
Phone: (805) 565-6184
Office Location: Winter Hall 304

Office Hours
by appointment

Non-commutative algebra

Professor Leech has taught at Westmont since 1985. When he's not proving theorems about idempotents and skew lattices, he enjoys painting, and consuming a good cup of coffee.

Professor Leech has taught

  • Geometry
  • Linear algebra
  • Calculus
  • Algebra
  • Introduction to Statistics


  • Ph.D. in Mathematics, UCLA
  • M.A., Dallas Seminary
  • B.A., University of Hawaii

Research Interests

  • Noncommuntative lattices

Selected Publications

  • "On maximal idempotent-closed subrings of Mn(F)" (with K. Cvetko-Vah), International Journal of Algebra and Computation, to appear.
  • "Rings whose idempotents form a multiplicative set (with K. Cvetko-Vah), Communications in Algebra, to appear.
  • Cancellation in skew lattices (with K. Cvetko-Vah, M. Kinyon and M. Spinks), Order, 28 (2011),
    9 - 32.
  • Skew Boolean algebras derived from generalized Boolean algebras (with M. Spinks), Algebra Universalis, 58 (2008), 287-302.
  • Associativity of the nabla-operation on bands in rings (with K. Cvetko-Vah), Semigroup Forum, 76 (2008), 32-50.