Thessa started out as journalist, covering a wide range of subjects for Dutch and English-language publications (Hollywood Reporter, Billboard, Screen International). Because she is familiar with the way in which journalists work and which angles they tend to look for, she has built up a large network of excellent media contacts.

As editor in the Corporate Communications department at Philips Electronics in Amsterdam, Thessa dealt with executives at all levels, from all over the world - presenting internal campaigns and company news to the global readership of the Mondial magazine. She worked closely together with outside consultancy firms, graphic designers and photographers in ensuring consistency of the publication's editorial concept.

After moving to London in 2000, Thessa worked for the Goethe-Institut as a cultural program office. She increased the visibility of German cinema in the UK by working together with festivals (London, Edinburgh), major venues (Barbican, ICA, Curzon Soho) and establishing a network of key media, such as The Times, Time Out, The Economist and BBC Radio London.

Following a relocation to New York in 2003, Thessa joined the New York Goethe-Institute, she was involved in creating a new corporate brand, working closely together with design company Hello NYC. She created a film catalog, a newsletter, organized events with the New Museum and the Grey Gallery and moderated a literary discussion. The Dutch Consulate-General commissioned her to write a government report about American film schools. In 2004, New York’s School of Visual Arts asked her to create and teach a Film Criticism course for undergraduate students.

With an associate degree in Russian and a Master of Arts degree in Italian, she has provided translating, subtitling and interpreting services for clients in New York, Los Angeles and Europe. Thessa speaks conversational Japanese.

Thessa has created and executed publicity strategies for film premieres in New York, Berlin, Venice and Toronto. She was responsible for the world premiere of the Dutch film DUNYA & DESIE, Holland's 2008 entry for the Best Foreign Language Film Oscar.