Daniel S. Ahearn, Ph.D., 90, of Winchester, passed away on March 30, 2016. He was the beloved husband of Louise (Freeman) Ahearn, and the loving father of Barbara Ahearn of Arlington and the late Kathleen and JoAnne Ahearn. Born in New York City, Daniel was the son of the late Daniel and Margaret (Walter) Ahearn. A World War II veteran, he served in the 399th Infantry 100th Division from 1943 to 1946 in France and Germany. He received his bachelor’s degree from Columbia College in 1949 and his Ph.D. in economics from Columbia University in 1961. His book “Federal Reserve Policy Reappraised 1951-1959” was based on his Ph.D. thesis. Daniel spent his roughly 65-year working life in positions involving economics, investments and monetary and fiscal policy. From 1961 to 1995, he was at Wellington Management Company with positions including senior vice president, partner and chairman of the investment policy group. In 1963 he left Wellington to serve as Assistant Secretary of the Treasury for Debt Management until 1965. He also advised the Treasury Dept. for about 25 years as a member of the Government and Federal Agencies Securities Committee of the Public Securities Assoc. After leaving Wellington, Daniel formed Capital Markets Strategies where he continued advisory work. In Winchester, where he was a resident for 47 years, Daniel was an Investment Trustee of Winchester Hospital from 1974-2012. He is widely remembered for his reports on investments to the annual meeting of the Winchester Hospital board. Funeral Services are private. Memorial donations may be made to Columbia College, mailed and payable to Columbia University Gift Systems, MC 4524, 622 West 113th St., New York, NY 10025 or the Alzheimer’s Association 480 Pleasant St., Watertown, MA 02472.