[2] Reeves joined the International Western Electric Company in 1923, and was part of a team of engineers responsible for the first commercial transatlantic telephone link.
He joined the Royal Aircraft Establishment at Farnborough and took part in the development of countermeasures against the German radio navigation systems, the so-called 'battle of the beams'.
Reeves was later transferred to the Telecommunications Research Establishment as part of a team of scientists and engineers developing Britain's own radio navigation aids.
Together with Frank Jones of the Telecommunications Research Establishment, Reeves developed a new system called 'Oboe', which offered pin-point accuracy to within 50 yds (45m), and was resistant to jamming.
[4] After the war, Alec Reeves managed a team led by Charles K. Kao and George Hockham at Standard Telecommunication Laboratories – initially at Enfield, North London, and later at Harlow Essex – which invented optical fibres as a means of communicating large quantities of information.