Born in St Albans in 1931, Summers was born into a family of theatrical tradition and his father Walter Summers (1896-1973) was a film director and screenwriter.
Summers began directing in 1960 with a film Depth Charge, the screenplay of which he also wrote, but he immediately turned his attention to television and directed episodes of Desert Hi-Jack, Interpol Calling and four episodes of International Detective between 1960 and 1961.
In 1962 he directed the Tony Hancock feature film vehicle The Punch and Judy Man, Crooks in Cloisters (1964) with Barbara Windsor, and Dateline Diamonds (1965) starring William Lucas and Kenneth Cope. Meanwhile he continued in television with Man of the World and, in 1965, episodes of Court Martial, Gideon's Way and two more films Ferry Cross the Mersey and San Ferry Ann.
In 1966 Summers directed episodes of Danger Man; he also directed some 12 episodes of The Saint from 1964 to 1966. Episodes of The Saint that Summers filmed include "The Lawless Lady", "The Death Penalty" and "The Unkind Philanthropist" (1964), "The Abducters" (1965) and "The Man Who Liked Lions" (1966).
This was followed in 1967 by The Baron and several foreign films of that year The Vengeance of Fu Manchu, Five Golden Dragons and La Casa de las mil muñecas. He also directed an episode of Man in a Suitcase in 1968.