Daniel Gerhard Brown (born June 22, 1964) is an American author best known for his thriller novels, including the Robert Langdon novels Angels & Demons (2000), The Da Vinci Code (2003), The Lost Symbol (2009), Inferno (2013), and Origin (2017). His novels are treasure hunts that usually take place over a period of 24 hours. They feature recurring themes of cryptography, art, and conspiracy theories. His books have been translated into 57 languages and, as of 2012, have sold over 200 million copies. Three of them, Angels & Demons, The Da Vinci Code, and Inferno, have been adapted into films, while one of them, The Lost Symbol, was adapted into a television show. The Robert Langdon novels are deeply engaged with Christian themes and historical fiction, and have generated controversy as a result. Brown states on his website that his books are not anti-Christian and he is on a "constant spiritual journey" himself. He states that his book The Da Vinci Code is "an entertaining story that promotes spiritual discussion and debate" and suggests that the book may be used "as a positive catalyst for introspection and exploration of our faith." Daniel Gerhard Brown was born on June 22, 1964, in Exeter, New Hampshire. He has a younger sister, Valerie (born 1968) and brother, Gregory (born 1974). Brown attended Exeter's public schools until the ninth grade. He grew up on the campus of Phillips Exeter Academy, where his father, Richard G. Brown, was a teacher of mathematics and wrote textbooks from 1968 until his retirement in 1997. His mother, Constance (née Gerhard), trained as a church organist and student of sacred music. Brown was raised an Episcopalian, and described his religious evolution in a 2009 interview: "I was raised Episcopalian, and I was very religious as a kid. Then, in eighth or ninth grade, I studied astronomy, cosmology, and the origins of the universe. I remember saying to a minister, 'I don't get it. I read a book that said there was an explosion known as the Big Bang, but here it says God created heaven and Earth and the animals in seven days.