Marcin Sosiński is one of the most awarded and influential creative leaders in Central and Eastern Europe. He spent the majority of his professional life at McCann, shaping some of the network’s most celebrated campaigns in the region. Today, he serves as Chief Creative Officer of Dentsu Creative Poland & CEE, where he continues to champion the voice of the region on the international stage.

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. In 2025 he was invited into the Golden Drum Hall of Fame, which honours individuals who have left a lasting mark on the creative industry.

Beyond his work with global brands, Sosiński is deeply involved in fostering creativity in his home market. As a board member of the Ad Creators Club and the Marketing Communication Association SAR, he actively supports the development of the industry in Poland and is committed to mentoring and nurturing emerging talent.