Peter R. Isler is a senior partner at NKF with very broad experience in various areas of law including membership in the boards of directors of  Swiss corporations. He is highly recognised by clients because of his profound legal knowledge and negotiation skill. In 2001, Peter was named one of the two best business lawyers in Switzerland by Chambers and is listed as a top tier lawyer in many directories.


Peter R. Isler has been involved in many complex acquisitions and takeovers. He acts as expert for corporate governance and compensation issues, as arbitrator in commercial arbitration cases and as executor in large estate matters. He teaches at the University of Zurich, School of Law and has been an examiner of the Zurich Bar Exam Commission for more than 30 years. He is co-editor of the Swiss Journal of Law and has written many legal publications.

Peter R. Isler was until 2021 also elected president of the Alumni Organizations of the University of Zurich and a member of the Board of Trustees of the UZH Foundation.

1977 Admitted to the Bar, Rechtsanwalt
1974 Harvard Law School, LL.M.
1974 University of Zurich School of Law, Dr. iur., summa cum laude
Best Lawyers 2010 – 2025
The Legal500 EMEA 2023 – Hall of Fame
IFLR1000 2017 – 2023 – Expert Consultant
Who’s Who Legal: Switzerland 2016 – 2024
Chambers Global 2000 – 2022 — Senior Statespeople
Chambers Europe 2007 – 2022 — Senior Statespeople
The Legal500 EMEA 2022 – Hall of Fame
The Legal500 EMEA 2021 – Hall of Fame
Who’s Who Legal: Global 2019
Best Lawyers Switzerland 2018 – Lawyer of the Year for Corporate Law
The Legal500 EMEA 2017 – Leading Individual
Best Lawyers Switzerland 2016 – Lawyer of the Year for Banking and Finance
Best Lawyers Switzerland 2015 – Lawyer of the Year for Finance Law
  • Swiss Bar Association
  • Zurich Bar Association
  • IBA International Bar Association
1981 Partner, Niederer Kraft Frey
1977 Associate, Niederer Kraft Frey
1974 Associate, Homburger Achermann Müller & Heini
1970 Assistant for Corporate and Commercial Law at the University of Zurich School of Law




Market Perception

«Peter Isler is highly regarded for his expertise assisting clients from the banking sector with regulatory issues. »
Chambers Global 2022
«The ‘very smart’ Peter Isler assists clients from the banking industry with regulatory issues. »
Chambers Global 2021
«Peter Isler is held in high esteem for his knowledge of financial transactions. He has a wealth of expertise advising high-profile domestic and international banks. »
Chambers Global 2020

Awards & Rankings


NKF ranked top-tier firm in six practice areas by IFLR1000 2023

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24 partners from NKF listed in The Best Lawyers in Switzerland 2018

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20 NKF partners listed in Best Lawyers 2015 – one thereof as “Lawyer of the Year”

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In the Media


The impact of the financial crisis in 2008 on Swiss banks and law firms

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Die VegüV in Kollision mit ausländischem Arbeitsrecht

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Das Konkurrenzverhältnis der Verantwortlichkeitsklage zu anderen Rechtsbehelfen

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Rechtsfolgen einer mangelhaften Delegation von Geschäftsführungsaufgaben in einer Verantwortlichkeit…

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