TITUSVILLE, Nov. 19 -- James Henderson, Assistant Professor of Mathematics and Philosophy at the University of Pittsburgh at Titusville, recently completed a doctorate in philosophy at the State University of New York at Buffalo.  He successfully defended his dissertation, “The Relative-State Interpretation of Quantum Mechanics,” on October 29.  His degree will be conferred on February 1, 2003.  Formerly of Russellville, Arkansas and a 1982 graduate of Russellville High School, Henderson is the son of Grace Henderson and the late Jack Henderson.  Henderson and his wife, Dr. Rhonda Clark, reside in Titusville.