Data Protection
Poland
1 year ranked
LAWYER PROFILE
Sławomir Kowalski
Europe 2026
Ranked in 1 practice area
About
Provided by _Just_LAW Jastrun Kowalski sp. k.
Practice Areas
Sławomir Kowalski is a leading expert in personal data protection and privacy with over a decade of specialized experience. He advises data-intensive industries, including the largest insurance companies and major IT/e-commerce businesses. His practice focuses on assessing complex business models employing cutting-edge technologies such as machine learning and predictive analysis. He has successfully represented clients in high-profile cases before Polish Data Protection Authorities, notably defending morele.net against substantial penalties in early 2023.
He is consistently recognized by prominent legal directories: Chambers and Partners (Band 4 in TMT: Data protection for four years), Legal 500 EMEA ("Next Generation Partner" 2020-2023), and Rzeczpospolita ranking (“Leader, no. 1 lawyer in 2025").
Before establishing _Just_LAW, Mr. Kowalski co-founded Maruta Wachta’s Data Protection practice, recognized as a top-tier practice.
Career
Previous professional experience:
- Maruta Wachta – Partner
- PwC Legal – Advocate
- LDS Łazewski Depo & Partners – Lawyer
- CMS Cameron McKenna – Lawyer
Chambers Review
Provided by Chambers
Chambers European Guide
Data Protection - Poland
Band 3
Individual Editorial
Sławomir Kowalski advises clients on data protection matters, including GDPR compliance and international data transfers.
Strengths
Provided by Chambers
Sławomir Kowalski is very decent and great to collaborate with. He is really driven, interested and professional when it comes to privacy and advising clients on privacy.
Data ProtectionChambers European GuideSławomir Kowalski consistently demonstrates excellent service standards and a high level of legal maturity. His ability to address sensitive and complex GDPR-related issues showcases strong analytical capability and advanced legal reasoning.
Data ProtectionChambers European GuideHe is insightful, very detail-oriented and always looking for the innovative solutions to the problem at hand.
Data ProtectionChambers European Guide
Ranked Individuals at _Just_LAW Jastrun Kowalski sp. k. (2)
Poland
Daniel Jastrun
Corporate/M&A: Mid-Market
View profile Sławomir Kowalski
Data Protection
View profile
What success is built on
Chambers is the leading data and intelligence partner for the legal sector.