I liked your thoughts about David Richards' work, so I want to hear what you have to say about Mack and his work besides Queen. This is also straight from Wikipedia.
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Reinhold Mack
Reinhold Mack (aka Mack) is a German record producer and sound engineer, mostly known for his collaborations with rock bands Electric Light Orchestra and Queen.
Most of this work took place at Giorgio Moroder's Musicland Studios in Munich, which became famous after Marc Bolan & T.Rex (with producer Tony Visconti) first discovered it for recordings in 1973. In 1981 the Queen album The Game brought Mack and the band a Grammy Award nomination for Producer of the Year (Non-Classical).
Mack's third son, John Frederick Mack, was named by Freddie Mercury and was a godson of both Mercury and Queen bassist John Deacon.
Mack is referenced in the lyrics of the Queen song "Dragon Attack" on their 1980 album The Game, which he produced with the band: "gonna use my stack/it's gotta be Mack".
Selected discography
Albums worked on as sound engineer:
T.Rex: "Zinc Alloy and the Hidden Riders of Tomorrow" (1974)
Electric Light Orchestra: Face the Music (1975)
Electric Light Orchestra: A New World Record (1976)
Sweet: Give Us a Wink! (1976)
Electric Light Orchestra: Out of the Blue (1977)
Electric Light Orchestra: Discovery (1979)
Electric Light Orchestra: Xanadu (1980)
Electric Light Orchestra: Time (1981)
Brian May & Friends: Star Fleet Project (1983, Mini Album; mixed by Mack)
Electric Light Orchestra: Balance of Power (1986)
Queen: Live Magic (1986; recorded by Mack and David Richards)
Queen: Live at Wembley '86 (1992; recorded by Mack)
Queen: Queen on Fire - Live at the Bowl (2004; recorded by Mack)
Queen: Queen Rock Montreal (2007; recorded by Mack)
Rainbow: "[{Rising}] " (1976)
Albums produced or co-produced by Mack:
Scorpions: "Fly to the Rainbow" (1974)
Deep Purple: "Stormbringer" (1974)
Rolling Stones: "Its Only Rock N Roll" (1976)
Deep Purple: "Come Taste the Band" (1975)
Rory Gallagher: "Calling Card" (1975)
Rolling Stones: "Black and Blue" (1976)
David Coverdale: "White Snake" (1977)
Peter Straker: Real Natural Man (1980)
Queen: The Game (1980)
Queen: Flash Gordon (1980)
After the Fire: 80-f (1980)
Sparks: Whomp That Sucker (1981)
Billy Squier: Don't Say No (1981)
After the Fire: Batteries Not Included (1982)
Sparks: Angst in My Pants (1982)
Queen: Hot Space (1982)
Billy Squier: Emotions in Motion (1982)
Queen: The Works (1984)
Roger Taylor: Strange Frontier (1984)
Meat Loaf: Bad Attitude (1984; produced by Meat Loaf, Paul Jacobs and Mack)
Freddie Mercury: Mr. Bad Guy (1985)
BAP: Ahl Männer, aalglatt (1986)
Queen: A Kind of Magic (1986)
Extrabreit (German band): Sex after three years in a submarine (1987)
Heavy Pettin: Lettin Loose (1987; produced by Brian May and Mack)
Extreme: Extreme (1989)
Bonfire: Knock Out (1991)
Black Sabbath: Dehumanizer (1992)
Loud: Psyche 21 (1992)
SBB: New Century (2005)
Julian Mack: Have you no decency (2005)
Liquid Meat: Beat the Meatles (2006)
The Shazam: M3TEOR (2009)
Liquid Meat: Maximum Carnage (2009)
Big Wood: Big Wood (2012)
Custard: Infested by Anger (2012)
Symphonika: "In Dreams" (2013)
Interesting note on that 86'BAP Album. Former BAP guitar player " Major Heuser" said that Freddie and him doing some improvisations on the demos he recorded for that album.Maybe David R. Fuller get his dirty hands on them...who knows.