- Father of Brazilian actress Dandara Guerra.
- He has a daughter with actress Leila Diniz born in 1971 named Janaina Diniz Guerra (actress).
- He has a grandson named Martim born in 2005 (Dandara's son).
- He is a director and a writer of theater plays.
- His parents were Portuguese and they immigrated to Mozambique where Ruy was born.
- Moved to Brazil in 1958.
- He's also a song writer. He wrote songs with Chico Buarque.
- Studied cinematography in Paris between 1952 and 1954 in IDHEC.
- He's descendant of Portugueses.
- He was a cinema critic.
- He's one of the most respected cinematographers of Brazil.
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