List of Famous people who died at 91

Boris Caesar Wilhelm Hagelin was a Swedish businessman and inventor of encryption machines.

Tereza Costa Rêgo was a Brazilian painter. She received the Ordem do Mérito Cultural in 2011.

Emil H. Praeger was an American architect and civil engineer.

Ashton Budd Collins Sr. was an American inventor and marketer. He was the creator of Reddy Kilowatt, a popular corporate trade symbol for the electric utility industry for much of the 20th century.

Orhan Alp was a Turkish mechanical engineer, politician and former government minister.

Maurice "Jake" Day was an American artist, sculptor, photographer, naturalist and illustrator. He is best known for creating the fawn-like character of Bambi for the 1942 animated Walt Disney feature film Bambi.

Jan Tinbergen was an important Dutch economist. He was awarded the first Nobel Memorial Prize in Economic Sciences in 1969, which he shared with Ragnar Frisch for having developed and applied dynamic models for the analysis of economic processes. He is widely considered to be one of the most influential economists of the 20th century and one of the founding fathers of econometrics. It has been argued that the development of the first macroeconometric models, the solution of the identification problem, and the understanding of dynamic models are his three most important legacies to econometrics. Tinbergen was a founding trustee of Economists for Peace and Security. In 1945, he founded the Bureau for Economic Policy Analysis (CPB) and was the agency's first director.

Ye Qingyao was a Chinese mechanical engineer and politician born in Japanese Taiwan and educated in Japan. In 1947, he participated in the February 28 rebellion against Kuomintang rule in Taiwan, and was imprisoned on Green Island for several years before escaping to mainland China from Kinmen in 1956. In China he worked as an engineer, and served as Chairman of Fujian Provincial Committee of the Taiwan Democratic Self-Government League and Vice Chairman of the Fujian Chinese People's Political Consultative Conference (CPPCC).