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Welcome to De Clercq's anniversary page, where we celebrate 175 years of history. Since its founding in 1850, our firm has established itself as a reliable partner for legal services. Over the years, De Clercq has evolved from a solo practice and family business into a dynamic and leading law firm. Throughout these years, our core values—integrity, professionalism, and social responsibility—have always been the foundation of everything we do.
Today, 175 years later, we take pride in our role in the region, which now extends far beyond. Our firm is firmly rooted in the legal world, with a team of dedicated professionals committed to providing the best solutions for our clients. While we reflect on our rich history, we mainly look forward with confidence in the future and unwavering dedication to the values that have defined us for 175 years.
To mark this special occasion, we are organizing a series of inspiring and unique events for our clients and partners. From interactive workshops and sporting challenges to collaborative charity efforts—there’s something for everyone. We warmly invite everyone to join us in celebrating this exceptional year. Stay tuned to this page for more events, registration options, and further details.
January 24: Workshop AI in practice
Artificial intelligence (AI) has the potential to transform your organization. But what exactly is AI, and how can you use it effectively? What does your organization need to implement it? And most importantly, how can you ensure compliance with AI laws and regulations? Join this practical session filled with insights and inspiration. Register here.
February 13: Roundtable discussion on co-determination
An interactive session as part of the Month of Co-determination, focusing on: “The Organization in Motion: Organic Change.” After a brief introduction to organic change and its dilemmas, participants will exchange experiences and learn from each other through provocative statements. Sign up here (limited spots available) and share experiences with fellow professionals!
February 18: Workshop – Generative AI and the future of cybersecurity
Cybersecurity is more critical than ever. During this engaging session, experts will share practical tips and insights to enhance your organization’s security. Register here.
March 26: Soup bus with the Salvation Army
On this day, De Clercq will team up for a meaningful volunteer activity. Together, we’ll make a difference while sharing a unique experience with colleagues.
May 11: Leiden Marathon
A sporty day full of movement and connection: run with us in the Leiden Marathon!
June: Cycling/touring event
Hop on your bike for a beautiful cycling or touring adventure. Enjoy the nature, the challenge, and, above all, the shared journey.
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.