1. Prof. of Civ. Engrg., W. M. Keck Lab. of Hydraulics and Water Resources, California Inst. of Tech., Pasadena, Calif.; and during 1962-1963, Visiting Prof. of Civ. Engrg., Hydrodynamics Lab., Massachusetts Inst. of Tech., Cambridge, Mass.
2. Prof. of Irrig., Faculty of Engrg., Univ. of Alexandria, Alexandria, Egypt, U.A.R.