Background
Grosjean was born on 25 July 1920, in Chalon-sur-Saône, France.
Grosjean was born on 25 July 1920, in Chalon-sur-Saône, France.
This involved a short stint as a Security Service (MI5) double agent during World World War II (code name FIDO). He then became a successful archeologist in Corsica. He entered the French Air Force in 1939 and spent the next three years in various postings, among them Fighter Group (Government College) 2/1 in Le Luc, Var.
When the Germans invaded the non-occupied part of France in November 1942, Grosjean was demobilized.
So as to join Charles de Gaulle in London, he put together a very risky strategy: he made the Germans believe that if they helped him get over to England, he would send back various types of information. Grosjean reached England in July 1943 and reported his cover story at the start of his stay at the Royal Victoria Patriotic School (London Reception Centre).
He agreed to act as a double agent for the Security Service (MI5) and was part of the Double-Cross System from August 1943 to May 1944. In the summer of 1944 he was sent to Algeria and then to Morocco where he was an instructor on P-39s.
After a transition period, during which he trained as an archeologist and took part in digs with L"Abbé Henri Breuil, the famous French archeologist, he joined the French National Centre for Scientific Research (National Center for Scientific Research).
In 1954, he left for Corsica and began what was to be a very successful research career spanning twenty years studying the Corsican megalithic civilization. He uncovered quite splendid sculpted menhirs at Filitosa, Cauria and Palaghju, for example, as well as megalithic fortified settlements at Alo-Bisucce, Cucuruzzu and Araghju. In the summer of 1975, at the height of his career, and while working on his new museum in Sartène, Grosjean died of a heart attack.
He was fifty-four years old.
During that time he was also a member of the Free French Air Force.