He worked in the early 1960s with director Tony Richardson on the film versions of A Taste of Honey (1961), The Loneliness of the Long Distance Runner (1962) and Tom Jones (1963).

In the 1990s he moved to Stavros, near Chania in Crete, the town where he shot Zorba the Greek in 1963.

He was featured in the book Conversations with Cinematographers by David A. Ellis, published by Scarecrow Press in 2011.

He made his debut as an actor in Richard Linklater's Before Midnight (2013), where he played an older British writer settled in Greece.

On January 26, 2008, the American Society of Cinematographers (ASC) presented Lassally with an International Achievement Award at the 22nd Annual ASC Outstanding Achievement Awards celebration, at the Hollywood and Highland Grand Ballroom, Los Angeles.