Marcin Sosiński is one of the most awarded creative leaders in Central Eastern Europe, renowned for shaping work that blends innovation with real-world impact. As Chief Creative Officer for Dentsu Creative across Central and Eastern Europe, he leads seven markets, with a mission to redefine creative boundaries through technology and storytelling.

Sosiński believes that the unique challenges of the CEE region fuel innovative thinking capable of solving both business and societal issues on a global scale. His campaigns have received top honors at all major festivals, including Titanium and two Grand Prix at Cannes Lions, a D&AD Black Pencil, Grands at the Clios, LIA, Eurobest and many more. He is best known for his groundbreaking work with Mastercard - ‘Where to Settle’ and ‘Room for Everyone’, which helped shape the brand’s narrative around social responsibility and purpose-driven innovation, securing both Effie Agency of the Year and Cannes Lions For Good Agency of the Year.

Beyond his work with global brands, Sosiński is deeply involved in fostering creativity in his home market. He actively supports the development of the industry in Poland as a board member of the Ad Creators Club and is committed to mentoring and developing emerging talent.