Harrison was born in North London in 1932 to a city engineer and a homemaker. As a child, he sought out neighbours' pianos to play, by peeking in windows and then requesting to come in and play. At age eight his parents finally bought him a piano of his own, and he started lessons. From age ten he performed publicly, and in 1949 he won teenage talent of the year in a London competition in which he played Piano Sonata No. 32 by Beethoven. He was invited to perform multiple times on BBC's Children's Hour.[2]
A scholarship to the Royal Academy of Music allowed him to study with pianist Harold Craxton. He also studied with Carlo Zecchi in Rome and Salzburg, and Ilona Kabos in London. In the late 1960s, despite having a full schedule teaching and performing in Britain, he took the position at the University of Saskatchewan in order to have a more secure job, and moved with his wife and four children to Saskatoon, Canada. He taught piano, the history of opera, and a particularly popular class, music appreciation.[2]
He continued performing as well, and in 1984 gave a solo performance at Carnegie Hall. He also accepted multiple invitations to perform on CBC Radio broadcasts.[2] His compositions included a Bagatelle for piano, and music to poems by Christina Rossetti.[1]