Dr. Yongjian Gu is a professor at the United States Merchant Marine Academy (USMMA) and an adjunct faculty at New York Institute of Technology (NYIT). He teaches thermal-fluids, total energy systems & design, propulsions, steam turbine & marine components, gas turbine & auxiliary equipment, and engineering economics courses to undergraduates and graduate students. Dr. Gu holds a license of registered Professional Engineer (P.E.) in the State of New York. He also holds a certificate of professional Oracle Database Administrator (DBA). Prior to teaching at the academic institutions, he worked at industrial corporations, consulting firms, and the U.S. Department of Energy's (DOE) national laboratory as a senior mechanical engineer, project engineer, and lead engineer for many years. He has rich and valuable academic and professional experiences in dimensions/units/unit conversions, HVAC system, piping systems, thermal energy systems, and renewable/sustainable energy applications. Dr. Gu has many publications in his subject areas of teaching and professional expertise. He serves as peer-reviewers of multiple scientific and technical journals. He also sits on several professional committees and board members.