[2] Accordingly, he started taking courses in dancing at the age of six years[3] and registered without the knowledge of his parents in the Zurich Boys' Choir, where he for the first time made friends.

Over the following four years, he realised this interactive performance altogether 55 times in 22 cities, mainly in Switzerland, but also in Belgium, Germany, France,[15] Hong Kong,[16] Japan,[17] the Philippines,[18] Spain, Thailand[15] and the United States.

[19][20] Hellmann offered to by-passers to execute any service to them, at once and on-site in a tent, provided that both sides could agree on the conditions within the applicable legal framework and on the price.

[15] The project was meant to explore capitalist exchange rates of money and power in interpersonal relationships and to illustrate that there is basically no difference between sex work and other professions.

[1] From 2015 on, Hellmann continued to deal with this subject through his character Traumboy ("dream boy"):[23] as a male prostitute he confronted his audiences with the stereotypes surrounding sex work[3] to demystify the issue and to thus fight against the social stigma associated with that profession.

If you have a problem with that, you should work to get rid of poverty and discrimination around the world, but not to abolish prostitution.»[21]Since society usually accords self-determination to men rather than to women when it comes to prostitution as well, Hellmann produced the female equivalent Traumgirl with the German-Polish actress Anne Welenc (born 1987) which premiered in 2019 at the Edinburgh Festival Fringe.

[29] During research for the production of Requiem for a piece of meat he read the book Artgerecht ist nur die Freiheit ("Only freedom is species-appropriate") by Turco-German writer Hilal Sezgin and became vegan.

[30] He subsequently created the solo shows Dear Human Animals and Try walking in my Hooves, the music album Purple Grass and the exhibition Planet Moo.

In order to raise attention for the issues of animal rights and climate justice to a wider audience beyond the art festivals Hellmann also sought appearances in mainstream media.