Day was born in
Sheen, England. He worked his way up from
clapper boy to
camera operator then
cinematographer while in his native country, and began directing in the mid-1950s. His first film as director, the black comedy
The Green Man (1956) for the writer-producer team of
Frank Launder and
Sidney Gilliat, gained good reviews. Using this as a starting point, Day went on to become one of the industry's busiest directors. He directed several
Tarzan films. He relocated to
Hollywood in the 1960s and directed many TV episodes and made-for-TV movies. He occasionally had small parts in his own productions, including
The Haunted Strangler (1958),
Two-Way Stretch (1960), and the TV mini-series
Peter and Paul (1981). In the 1970s and 1980s, Day would direct episodes of numerous American television shows, including
Barnaby Jones,
The F.B.I.,
Dallas, ''
Walt Disney's Wonderful World of Color, and Matlock''. ==Personal life==