He was a man of dynamic energy and infectious enthusiasm, showing a wide interest in the welfare of others. During the Second World War he was a Squadron Leader and Commandant of the Air Training Corps in Scotland. He pioneered the school cruises and had a close association with the Boys' Brigade. His ability in the field of education was recognised by his selection as a representative of Scotland in the Emergency Scheme for the Training of Teachers in India. For his services he was awarded the M.B.E.
Perhaps his greatest contribution was to Scottish Freemasonry. In 1948 he was appointed Grand Secretary of the Grand Lodge of Scotland which office he held till 1971, when his work was recognised by his appointment as Depute Grand Master. In his work for this organisation he became known in many parts of the world and throughout Scotland not only for his ability but also for his kindly, warm-hearted and friendly personality.
Dr Buchan was elected to Fellowship in 1940.