[2] He considered a career as a basketball player,[2] and briefly worked as a sea lion trainer at Borås djurpark.

Instead, he applied for a job at the radio program Glädjetåget and soon began writing for television, including the soap operas Rederiet and Tre kronor, in the 1990s.

[4] In 2006, Rosenfeldt was hired by the Swedish production company Filmlance International to create a crime series that was set in both Sweden and Denmark.

[5] The result was The Bridge, a Danish-Swedish co-production that focuses on a pair of detectives investigating a series of crimes that take place near the border of the two countries.

[7] Rosenfeldt and his friend Michael Hjorth have written a series of crime fiction novels which center around a forensic psychologist.