Joachim Fjelstrup was born in Herlev, Denmark. He graduated from The Danish National School of Performing Arts in 2013. Leading actor in Ole Christian Madsen's 1960's set romantic biopic "Steppeulven / Itsi Bitsi" about the great myth in Danish rock history Eik Skaløe. He has a great singing voice allowing him to sing and perform live.

Apart from numerous theatre plays in Copenhagen, Joachim has also worked on Aske Bang's graduation film "Den Fremmede / The Stranger" and will also play an important part in Josefine Kirkeskov Nielsen graduation film "Sol, Måne & Stjerner / Sun, Moon & Stars" from the same school, The National Film School of Denmark.