Died in Palo Alto after a brief illness on April 3, 2018. A Palo Alto resident since 1973, she was for several decades a dynamo of the Silicon Valley residential real estate industry. The daughter of Frank R. Mayo and Eleanor P. Mayo, Carolyn was born in Chicago in 1937 when her father, having earned his PhD in Chemistry at the University of Chicago, was teaching there. Already doing cutting-edge research, Dr. Mayo became an internationally recognized polymer chemist, ending his career with three decades at the Stanford Research Institute. Carolyn was educated at the Lab School, Northfield School for Girls, and Brown University, where she earned her bachelor’s degree in history. Her freshman year she met Roger Mansell, an engineering student at Brown. He asked her to marry him on their first date; after four years, she finally agreed, and they were married in the chapel at Brown University.