Manuel S. Gaspay teaches economics and management courses and is the Associate Dean for the School of Business at the Northwestern Polytechnic University (NPU) at Fremont. He began teaching Ecological Economics at the GreenMBA program in 2009. He also occasionally teaches at the National Hispanic University.

Manuel has considerable international professional experience. He was a member of the faculty of the Asian Institute of Management (AIM) from 1993-2000, teaching graduate degree management courses and executive development courses in Manila (Philippines), Jakarta (Indonesia), Kuala Lumpur (Malaysia), Thimpu (Bhutan) and Hanoi (Vietnam). He co-pioneered the teaching of an environmental management course and the incorporation of environmental sustainability topics in the regular business courses at AIM. He also served as the Director of the Environment Management Bureau of the Philippines from 1996-1997. He had consulted for development assistance agencies such as the Asian Development Bank (ADB), United Nations Development Program (UNDP), the United States Assistance for International Development (USAID), the Canadian International Development Assistance (CIDA) on analysis of economic policies and development program management. Early in his career, he worked in a rural development agency where he organized, trained and extended technical support to small-farmer organizations in the remote areas in the Philippines.

Manuel holds a Ph.D. in Development Economics and a Masters of Arts in Economics degree from the Stanford University. He also has a Masters in Industrial Engineering and a Bachelor of Science in Geodetic Engineering degree from the University of the Philippines.