[3] He was named after his paternal grandfather Gregers Winther Wulfsberg Gram, who served as Norwegian Prime Minister in Stockholm and County Governor of Hedmark.

After serving as a soldier in the early battles following the German invasion, he soon became involved in propaganda activity and the illegal press, he had to flee from Norway in 1941.

[1] After arriving in Great Britain, he was recruited by the Special Operations Executive and received military training with Norwegian Independent Company 1.

[4] He was paradropped into Norway together with Max Manus on 12 March 1943, and the two carried out a successful sabotage mission, Operation Mardonius, which resulted in the sinking of two ships and damage to a third on 28 April, despite the fact it was a very light night, and water conditions were such that the canoes generated a very visible phosphorescence in their wake.

Gram was also decorated with Norway's War Cross with sword in summer 1943, presented to him by King Haakon at a ceremony at the training school STS 26 in Scotland, near Nethy Bridge.

The recommendation particularly mentions the successful sinking of a German patrol vessel in Oslo harbour in February 1944, and the daring, but unsuccessful, daylight attack on the troopship Monte Rosa.