Mr. Farrell resumed his engineering studies at Hopkins and after earning a bachelor's degree in electrical engineering in 1948, he went to work for C&P.
He held various positions with C&P and American Telephone & Telegraph in Maryland, New York City and Washington. At the time of his retirement in 1984, he was division manager of transmission engineering in Silver Spring.
Mr. Farrell had been a member of the international board of the Institute for Electrical and Electronics Engineers, and had been director of its Region 2 from 1970 to 1980.
He was a former president of the Engineering Society of Baltimore, having served from 1983 to 1984, and a longtime member of its board. He also had been chair of the Baltimore Chapter of Communications Technology and was an active member of the American Institute of Electrical Engineers.
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Mr. Farrell was a member for many years of Calvary United Methodist Church in Annapolis, and chaired the building committee when it moved from State Circle to its present facility on Rowe Boulevard in 1974.