[3] He was born in Norway, but grew up in multiple places located in Jutland, and ended in Aalborg and took Danish exam in 1972 from Poul Paghsgades Skole.

He began in the 1970s as a member of the Danish General Workers' Union-factory youth, and has since taken on multiple position of trust in the trade unions.

Here he represented the party until 2015, where he was barred from another parliament term due to the rotation princip of the Red-Green Alliance.

Per Clausen has been described as being a diligent MP and has on multiple occasions, earned the title as the most pertinacious question-raiser of the § 20-spørgsmål i n the Folketing.

In 2008, LGBT Danmark named him politician of the year, citing his work to secure rights for gay, bisexual.