William Smith's Homepage  
William V. Smith Department of Mathematics Brigham Young University 372 TMCB Provo, UT 846026539 USA smithw at math dot byu dot edu 
Professor Smith joined the faculty of the Mathematics Department at BYU in 1985. Dr. Smith's specialties include the equations of classical physics and problems in the application of mathematics to biology. Examples of publications (pdf files). 
A calculus text: here
An elementary partial differential equations text: here
