Detlef Sommer

Chairman of the Board of Directors
of hba Rechtsanwälte AG
Lawyer since 2002
Notary public of the Canton of St. Gallen since 2002
Mediator since 2012
Office Zurich
Phone: +41-44-508-4002
Fax: +41-44-508-4001

Areas of expertise


  • University of Zurich (lic. iur. 1996)
  • Admitted to the bar in the Canton of St. Gallen (2002)
  • Admitted as a notary public of the Canton of St. Gallen (2002)
  • Mediation training at the University of St. Gallen Institute for Legal Studies and Legal Practice (2012)
  • Mediator UMCH

Professional Expertise

  • Chairman of the Executive Board of hba Rechtsanwälte AG, and additional corporate offices in various companies since 2014
  • Partner and regional head of the legal department at an international auditing and consulting firm from 2001 – 2014
  • Lecturer in company law at the University of Applied Sciences in Business Administration, Zurich, in MAS Controlling from 2008 – 2018
  • Lecturer for, the Swiss Association of Experts in Accounting and Financial Control, and holder of the Swiss diploma in finance and accounting (e.g. for M&A transactions) since 2010
  • Consultant for the Swiss School of Trustees (Schweizerische Treuhänder Schule) (e.g. in the Annual Financial Statements and Succession Planning certificate programmes) since 2012
  • Lecturer for TREUHAND|SUISSE Swiss Association of Professional Trustees (e.g. on real estate law, company law, labour law, succession planning) since 2016
  • Speaker for Fisca at national tax and fiduciary conferences since 2017
  • Member of the Board of the Swiss University Mediation Association UMCH since 2020


  • Swiss Bar Association
  • St. Gallen Bar Association

Foreign Languages

  • English