A manager with over 20 years of extensive expertise in the media and advertising industry. Specialist in marketing communication, media planning and client service managing. She began her career in 1995 in the StarcomMediaVest media house, where she was Managing Director since 2000. Later on, she continued to gain experience working in the London branch of StarcomMediaVest, Initiative Media agency, G+J publishing house and Interia. In 2009 she joined the Havas Media agency in the Havas Media Network, where she has been Managing Director since November 2013.

SAR member, juror in the Effie, Young Creatives Cannes Lions and Innovation industry contests, as well as laureate of awards: Cannes Lions, Effie, Innovation, Mobile Trend, Media Trendy and Mixx Awards. Renata Wasiak-Sosnowska was recognized in 2017 and in 2018 in the "100 Women of Business" national ranking of the Puls Biznesu magazine and took 2nd place in the Ad wo/Man 2017 industry competition organized by the Press magazine.

The Havas Media agency managed by her has been consistently ranked among the top media houses on the Polish market and received the ‘Success of the Year 2017’ title and for two consecutive years, the agency also won the "Growth of the Year" title (2025 and 2026) in the "Advertisement Panorama’ report by ‘Press’ magazine. It also received numerous awards such as "Strategic Partner" (2017), "High Effectiveness" (2018), "Year of Good Changes" (2020), ‘Innovation in DNA’ (2024) and ‘Effective Business Partner’ (2025) in Media and Marketing Poland's annual special report "Advertising Agencies and Media Houses". Moreover, the agency she manages has repeatedly won a number of prestigious awards such as Effie, Mixx Awards, Innovation Award, Forbes Diamond and Performance Diamonds.

At the 20th Anniversary Jubilee of Effie Poland, Havas Media was recognized as one of the 20 most successful media agencies in Poland.