Klaas has a strong reputation as an employment specialist for highly sensitive matters. He regularly advises and litigates on the dismissal of managing directors and other top management. He.also has expert knowledge in management and employee participation structures and as such is a member of the firm-wide Corporate Governance Team.

Klaas is a frequent speaker at seminars and courses designed for attorneys addressing various aspects of employment law. He regularly publishes articles and comments in the employment case law journal (JAR). He is also a co-author of a book which deals with the new employment legislation which came into force as of 1 July 2015. The updated edition was recently released.

Klaas has been ranked as Leading Individual in the Legal 500 EMEA 2020 edition and as Band 1 in Chambers Europe 2021.

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Memberships

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Nederlandse Orde van Advocaten (NOvA), 
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Vereniging Arbeidsrecht Advocaten Nederland (VAAN)
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European Employment Lawyers Association (EELA)
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Vereniging voor Arbeidsrechtadvocaten Amsterdam (VvAA)
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Qualifications

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Post-graduate course Employment law (with honours), Grotius Academy, 2005
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Dutch law, University of Groningen, 2000

What others say

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"Klaas Wiersma is a very strong professional whose attitude, personality and working style make him a great advisor in separation matters involving executive management. He is hands-on, swift, always available and very keen to do what needs to be done, avoiding unnecessary work."
Legal 500 (2021)
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Klaas Wiersma moves up in the rankings this year with a strong work portfolio and glowing client praise. His solution-driven style is remarked upon by clients, one calling him "hands-on, swift, always available and very keen to do what needs to be done." He advises on the employment aspects of M&A transactions, such as employee transfers, as well as collective and individual dismissals.
Chambers Europe (2021)
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"I really appreciate working with Klaas Wiersma, because of his very high degree of services and the ability to help us in a practical way with the (difficult) employment law issues we have to deal with."
Legal 500 (2020)
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"Klaas Wiersma is always available and has a very practical approach, he helps us resolve employment issues quickly and efficiently."
Legal 500 (2020)
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"Klaas Wiersma boasts extensive experience acting for large corporates on cross-border labour law matters, including mobility structures and flexible working structures. Wiersma is acclaimed by clients as a "great lawyer who is responsive and gives good advice." Another interviewee states that he is "very pleasant to work with, very knowledgeable, down-to-earth and a hands-on problem solver."
Chambers Europe (2020)
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"The 'hands-on and solution-driven' team at Loyens & Loeff 'has a can-do mentality' and 'excellent litigator' Klaas Wiersma is considered to be 'the engine behind his smoothly running team'."
Legal 500 (2019)
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"One client says that Wiersma is 'solution-driven, responsive and available,'while another notes: 'He is excellent at distilling complex situations into a context that is logical and easy to understand."
Chambers Europe (2019)
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"Clients view him as a 'very practical lawyer who has a lot of knowledge upfront,' and who provides 'short and direct advice."
Chambers Europe
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"Klaas Wiersma is extremely responsive and combines in-depth legal knowledge with a pragmatic hands-on approach."
Legal 500 (2022)
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"I worked directly with Klaas Wiersma, who was and is, incredibly knowledgeable, responsive, solution oriented, innovative, caring, compassionate and no doubt, has unquestionable integrity."
Legal 500 (2022)
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"Klaas Wiersma was always there when needed, able to build relationships quickly, and able to get to the root issues and challenges in a respectful and transparent way."
Legal 500
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"Klaas Wiersma and his team are extremely knowledgeable about the law and even better at understanding how to apply it for the particular matter at hand."
Legal 500 (2022)
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"I am specifically impressed with Klaas Wiersma’s ability to make our issues his own."
Legal 500 (2022)
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