[2] Lethbridge was a banker from 1969 to 1972, when he moved to New York City to embark upon a career as a painter and drawer.
[2] Through his relationship with the American artist Jennifer Bartlett, he met Jasper Johns, who "became a kind of mentor" to him, and due to their closeness, many incorrectly assumed that they were lovers.
[4] By 1988, his work was exhibited at the Julian Pretto Gallery, and he was the recipient of the Francis J. Greenburger Award.
[4] After Bartlett left him, he had relationships with the photographer Mary Ellen Mark, the feminist Germaine Greer, and the French novelist Katherine Pancol.
[4] Lethbridge lives in Manhattan and Connecticut and with until her death in 2020 Anne Hendricks Bass.