Theresa MacKinnon February 23, 1941 August 5, 2021 Cambria, California Theresa (Coffman) MacKinnon, loving wife and mother of two children died peacefully on August 5, 2021, at the age of 80. Theresa was preceded in death by her father, James, her mother, Ruth, and her brother James. She is survived by her husband Allan, her two children Laura and Allan Jr., her sister Nancy, and several nieces and nephews. Theresa was born in East Liverpool, Ohio to James and Ruth (Hogue) Coffman. She studied for her M.S. in Psychology at Ohio State University in 1963 and received her B.A. in Mathematics & Psychology from Muskingum College in Ohio in 1962. Upon finishing her Master's at Ohio State University, Theresa moved to California to teach at Los Angeles High School, where she was a Mathematics Instructor. In 1967, she married Allan MacKinnon in Los Angeles, where they had two children, Laura and Allan. In 1975, the family moved back East, where Theresa continued to teach advanced high school mathematics. In 1981, Theresa and her husband founded Modular Automation Corp., a robotics firm based in Greene, New York. She served as Executive Vice President of Operations until the company was acquired in 1999. In 2000, Theresa and her husband returned to California, retiring in Cambria where she was an active member of the community. She served as a deacon and thrift store volunteer at the Cambria Community Presbyterian Church, a member of the Cambria Garden Club, where she served on the Scholarship Committee. She was also a member of Cambria's Dance Club, Newcomers Club, and Wine Club. Theresa attended the Estero Bay United Methodist Church in Morro Bay, California until her passing. Theresa had a passion for interior design, landscaping, and gardening. She was also an avid traveler, visiting South America, Canada, Mexico, the Caribbean, Europe, and China. Theresa was a loyal friend, fearless in seeking justice for those who didn't have a voice. A special thanks to Southbay Maxicare in Los Osos for the loving care of Theresa. A memorial will be held at a future date. In lieu of flowers, donations may be made to Cambria Anonymous Neighbors.