Captain Isaac Joseph was educated at Canton High School, Cardiff, and the Welsh National School of Medicine, where he graduated in medicine at the young age of 21 years. After holding various hospital appointments in South Wales he joined the Royal Army Medical Corps at the outbreak of the Second World War and served in Malta, Sicily, Italy, and France.
He was decorated by General Montgomery in Sicily in 1943 with the Military Cross for crossing a mined bridge to attend serious casualties, seconds before the bridge blew up. His obituary states:
On demobilisation Isaac, known as Ivor, entered general practice in Canton, Cardiff, where he remained until his recent retirement owing to ill health. He was dedicated to his work and could not be persuaded to join any of the local committees, but his knowledge and appreciation of current medical affairs made him much sought after and a valued confidant. He was for several years chairman of medical boards in the Department of Health and Social Security and also a valued part time referee in the regional medical service of the Welsh Office. Ivor had a most cheerful and sincere manner, which endeared him both to his colleagues and to his patients, for whom nothing was too much trouble. He bore his terminal illness with extreme courage and selflessness.