Robert John "Mutt" Lange is a Zambian-born British record producer and songwriter. He has produced albums for artists such as AC/DC, City Boy, Def Leppard, The Boomtown Rats, Graham Parker and the Rumour, Outlaws, Foreigner, The Cars, Bryan Adams, Billy Ocean, Savoy Brown, The Corrs, Maroon 5 and Nickelback. He also wrote and produced songs with his then-wife, Canadian country singer Shania Twain. Her 1997 album Come on Over, which he produced, is the all time best selling album by a female artist. Lange also worked on "You and I" from Lady Gaga's second studio album Born This Way. A strict vegetarian and a follower of Sant Mat, Lange has not given an interview for decades and prefers to live a secluded life, primarily in Switzerland. He is known for his endurance in the studio and innovations in multitrack recording. 

November 11th, 1948 in Mufulira (Age 76) as Robert John Lange