Work on operator theory:

1. The curvature of a single operator on a Hilbert space, http://www.arxiv.org/math.OA/0006224
2. On a quotient norm and the Sz.-Nagy--Foias lifting theorem, J. Funct. Anal. 30 (1978), 311-328
3. (with B. E. Johnson) Operators commuting with a von Neumann algebra modulo the set of compact operators, J. Funct. Anal. 11 (1972), 39-61
4. Unitary dilations for commuting contractions, Pac. J. Math. 34 (1970), 481-490, http://projecteuclid.org/Dienst/UI/1.0/Summarize/euclid.pjm/1102976441
   
5. Isometric multipliers, Pac. J. Math 25 (1968), 159-166, http://projecteuclid.org/Dienst/UI/1.0/Summarize/euclid.pjm/1102986397
6. Weighted translation operators, Ph.D. dissertation, University of Michigan, 1965