1. Assistant Professor, Dept. of Civil Engineering, Queen’s Univ., Kingston ON, Canada K7L 3N6.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton AB, Canada T6G 2W2.
3. Professor, Dept. of Evolution, Ecology and Organismal Biology, The Ohio State Univ., Columbus, OH 43210.
4. Retired, National Water Research Institute, Environment Canada, Burlington ON, Canada L7R 4A6.