Here, Penn trained in military plastic surgery under Sir Harold Gillies and Sir Archibald McIndoe.

In this capacity he went to London to help with war casualties in need of plastic and reconstructive surgery, notably during the Battle of Britain. Penn enlisted as a part-time officer with the rank of major in the Union Defence Force (predecessor of the South African Defence Force), being called up in 1939 as a major attached to the 7th Field Ambulance. The military context: plastic and reconstructive surgery Raymond Dart at the University of the Witwatersrand. He also spent part of 1937 at the Mayo Clinic in Rochester, in the United States of America, then returning, with a short spell in London, to Johannesburg, where he was offered a part-time appointment as lecturer in Clinical Anatomy by Prof. He worked successively at the Orthopaedic Centre in Liverpool, at the then new British Postgraduate School in London, as acting Senior Surgeon at a County Council hospital in London, and as Resident Surgical Officer at the Royal Salop Infirmary in Shrewsbury. Married in 1934 Diana Malkin, Penn and his wife went to the United Kingdom, where he became a Fellow of the Royal College of Surgeons of Edinburgh in 1935. After World War I, the family moved to Johannesburg, where he was educated at Parktown Boys' High School and the University of the Witwatersrand. Penn was born in Cape Town in 1909, the youngest of 7 children. 3 The military context: plastic and reconstructive surgery.

Hopper jack penn