[2] Henriksen's enthusiastic musicianship on behalf of Esperanto and cross-cultural understanding through rock music has earned him popularity both in Europe[3][4] and America.

[5][6] American linguist Arika Okrent notes: "[Henriksen] appeared not to appreciate how bizarre it was to be a native speaker of an invented language.

Before you start getting indignant on his behalf, know that growing up he had plenty of contact with the world outside his home and learned to speak Danish as a native too.

"[2] In 1983, Henriksen was a co-founder of the Amplifiki[1] group (along with Bertilo Wennergren and Micke Englund), which performed throughout Europe in the 1980s.

He was instrumental in the founding and continued operations of the Sunda esperanto agado, a group that actively aids mutual Øresund-area cooperation among Esperanto clubs from Copenhagen and Helsingborg in Denmark and clubs from Malmö and Lund in Sweden.