In 2025, we celebrated the 175th anniversary of De Clercq. What began in 1850 as a sole proprietorship in Leiden has, over nearly two centuries, grown into a dynamic and leading national firm. Throughout all these years, our core values - integrity, professionalism, and social responsibility - have remained the foundation of everything we do.
Today, after 175 years, we take pride in our role within the region, which now extends far beyond its borders. Our firm holds a strong position in the legal landscape, supported by a team of dedicated professionals committed to delivering the best solutions for our clients. While we reflect on our rich history, our focus is firmly on the future—with confidence and an unwavering commitment to the values that have defined us for 175 years.
Our anniversary year was one of connection and purpose. We organized inspiring activities for clients and partners, aiming not only to reflect on the past but, above all, to share experiences and look forward. From interactive workshops and sporting challenges (Leiden Marathon, Harbour Tour Rotterdam) to joining forces for a charitable cause (Salvation Army), the year was filled with meaningful engagement.
1850 – Founded by Mr. Hendrik Neeb
The firm’s history begins with Hendrik Neeb’s admission to the bar in Leiden. He opens his practice on Hooigracht.
1894 – François Was becomes mayor of Leiden
François Was, a partner of Hendrik Neeb and a respected citizen of Leiden, resigns his law practice after much deliberation to become the city’s mayor. He leaves the practice to his nephew Otto Sipkes.
1915 – Willem de Clercq takes the helm
In 1915, Willem de Clercq starts his career at the firm. His dedication and legal talent quickly lay the groundwork for his future leadership. His vision, integrity, and focus on social responsibility remain the firm’s cornerstone values.
1954 – Paul de Clercq joins as partner
Paul de Clercq strengthens the firm and is joined a few years later by his brother Max. After Willem de Clercq’s unexpected passing in 1960, Paul continues the practice alone, upholding his father’s tradition. By 1975, Paul focuses on both corporate law and social advocacy while maintaining a general solo practice at Hoge Rijndijk 14.
1983 – Transition to a larger partnership
Ernst van Win joins the firm, starting as a student intern and becoming a partner in 1987. His efforts to enhance the firm’s reputation lead to the expansion of the team and a focus on labor and corporate law.
1988 – Second office opens
De Clercq becomes the first Leiden-based law firm to open a second office in Rijnsburg.
1989 – First female attorney, Henriëtte van Baalen
Henriëtte van Baalen joins the firm as its first female attorney and later becomes a partner. Her extensive societal involvement leads to her being named Leiden’s most influential person in 2018.
1990 – Rapid growth begins
The firm relocates to larger offices, marking the start of significant growth, reaching nearly 20 attorneys by 2000.
2000 – New office and 150th anniversary
De Clercq celebrates its 150th anniversary and opens a new location on Hoge Rijndijk.
2005 – Expansion to The Hague
The firm broadens its reach by opening an office in The Hague, serving an expanded client base in the capital.
2008 – Diversity and social responsibility
De Clercq receives recognition for its progressive approach to diversity and continues its long-standing commitment to social responsibility through initiatives like supporting the Ronald McDonald House.
2010 – Focus on sustainable legal solutions
De Clercq shifts its focus toward sustainable legal solutions, culminating in B Corp certification in 2024.
2015 – Regional leader to international player
The firm is acknowledged for its expertise across various legal fields and gains international recognition, including mention in the prestigious Legal 500 in 2023.
2023 – Transition to five corporate legal boutiques
De Clercq announces a strategic focus on five specialized corporate legal boutiques: Employment/Employee Participation/Mediation, IT/Privacy/Cybersecurity, Notary, Corporate Law, and Real Estate/Government.
2025 – 175th anniversary and future-proofing
In 2025, De Clercq celebrates 175 years and looks to the future, ready to innovate and adapt to the dynamic legal world. The firm is committed to challenges such as AI, ESG, cybersecurity, sustainability, and international growth.