He is known for his contributions to economic and social indicators research, as well as his work in public opinion polling.

Before focusing on his work at SWS, Mangahas held a teaching position at the School of Economics of the University of the Philippines.

His academic research has focused on economic development, social indicators, and public policy analysis in the Philippines.

As president of Social Weather Stations, Mangahas has played a crucial role in developing and conducting public opinion research in the Philippines.

Mangahas is a regular columnist for the Philippine Daily Inquirer, where he writes about economic and social issues.