As a graduate student at Ole Miss Civil Engineering Department, Clark took courses offered by CE, ME and EE departments. He conducted experiments for thesis research on curved channel hydraulics at the near-by USDA Sedimentation Laboratory. His thesis committee included Drs. Samuel DeLeeuw and Keith Boardman of CE, Dr. John Fox of ME, and Dr. Donald Parsons of USDA Sedimentation Laboratory.
Upon receiving his master degree from Ole Miss in January 1969, Clark entered New York State Division of Water Resources. In the next four years, he obtained his New York State Professional Engineer (PE) license and was promoted senior engineer. In 1973, he received a graduate fellowship and entered Cornell University. Papers based on his Ph.D. research on watershed hydrology were frequently cited and were included in the U.S. National Report (1975-78) to the International Union of Geodesy and Geophysics. He worked for four years (1976-80) at the New York State Department of Environmental Conservation as a senior research scientist, responsible for the development and application of mathematical simulation and modeling techniques in water quality management. In recognition of his contribution in this area, he was invited in 1979 by US Environmental Protection Agency (EPA) to participate in the National Workshop on verification of water quality models as one of the 50 experts. He joined the University of Hawaii faculty in 1980 and was promoted full professor in 1989. Over the last 21 years, he has served as the principal investigator of eight research projects supported by US Environmental Protection Agency (EPA), US Geological Survey (USGS), and US National Science Foundation (NSF). One of the USGS grants, entitled "Compatibility of Physically Based and Linear System Solute Transport Modeling Approaches and Their Conjunctive Application", was acquired after a national competition in which 34 projects were selected among 275 proposals. He is currently directing two research projects. One NSF project is to develop an engineering system for open ocean mariculture by using nutrient-rich deep ocean water. Another project, supported by the Industrial Technology Research Institute (ITRI) in Taiwan, is to develop a wind-powered reverse osmosis system for desalination and water treatment. His intensive research efforts have resulted over 60 scientific publications.
Clark, his wife Diana, and their three children are members of Chinese Lutheran Church of Honolulu. He is the Chair of the Church Building Committee for the construction of a new sanctuary building.Clark C.K. Liu's web page.