Mr Lowther-Pinkerton will work part-time from 2 May.
A former SAS man has been appointed as private secretary to Prince William and Prince Harry, Clarence House has said.
Jamie Lowther-Pinkerton, 44, who was an officer for 20 years, will work part-time from May.
He works as a security specialist in London, and had been an equerry to the Queen Mother from 1984-86.
His new job will involve contact with Sir Michael Peat, private secretary to Prince Charles, and Helen Asprey, personal secretary to the princes.
William, 23, is due to complete his degree at St Andrews University in June, while 20-year-old Harry is headed for the Royal Military Academy at Sandhurst in May.
Harry is headed for military training while William finishes study
Mr Lowther-Pinkerton himself graduated from Sandhurst in 1979 and was commissioned into the 1st Battalion Irish Guards.
The 44-year-old is currently a part-time consultant to Kroll Risk Management and runs his own safety awareness training company for young travellers and journalists.
His military career included a stint with the SAS in the first Gulf War, and posting to the Balkans in the mid to late 1990s working for senior Defence Ministry staff on strategic policy for the region.
He was awarded an MBE In 1990 for services to the special forces.