[1] He served with the Army Kinematograph Unit,[2] and was the uncredited editor for a military orientation film, The New Lot (directed by Carol Reed-1943).
[4] After the war he began a fruitful association with the film-making partnership called "The Archers", which was led by Michael Powell and Emeric Pressburger.
A 2010 appreciation of the film by Peter Canavese notes Mills' contributions, "The still astonishing expressionistic dance sequence that stands as a performance of the Ballet Lermontov's The Red Shoes ... is rapturous, as a feast of theatrical lighting and Technicolor photography (shot by the brilliant cinematographer Jack Cardiff), the choreography of Robert Helpmann, the music of Brian Easdale and the montage of editor Reginald Mills.
"[6] The Tales of Hoffmann (1951) also incorporated ballet in its adaptation of the original Offenbach opera, and André Bazin wrote at the time, "The cinema thus creates here a new artistic monster: the best legs adorned by the best voice.
[10] Other credits from this period include The Spanish Gardener (directed by Philip Leacock – 1956) and Joseph Strick's film Ulysses (1967), which adapted James Joyce's 1922 novel.
[11] Interviewing Strick in 2009, Henry K. Miller wrote, "the long montage sequence that accompanies Molly is a tour de force.
[16] He received BAFTA nominations for his editing of two films with director Franco Zeffirelli: Romeo and Juliet (1968) and Jesus of Nazareth (1977).