Stephan Kessler

Professional activity

Shortly after completing his master's degree in biochemistry, Stephan Kessler discovered his interest in intellectual property law, whereupon he successfully completed his postgraduate studies in intellectual property at ETH Zurich. Following a short internship, he took up his first position as a "patent liaison" in an internationally active medical technology company. In order to obtain the necessary practice for admission as a European Patent Attorney, he joined a law firm in Eastern Switzerland as a patent engineer, where he was able to gain experience in patent law in a variety of technical fields. Since 2009 he has been bringing this experience to Keller & Partner Patentanwälte AG.

Areas of expertise

  • Medical technology
  • Adhesive and polymer chemistry
  • Biotechnology
  • Processing and production of foodstuffs
  • Mechanics

High-precision handyman

As part of a graduate biochemist, Stephan Kessler’s DNA contains the ability to think his way into tiny, abstract structures not visible to the naked eye. Outside of office hours he likes to get more concrete and hands-on, be it by building small pieces of furniture, tending to the garden or trying out new recipes in the kitchen. A naturally curious person, Stephan enjoys diving into new technical areas and acquiring fundamental understanding in a variety of disciplines.


2014Entry in the Swiss Register of Patent Attorneys
2013Admission as representative before the European Patent Office (European Patent Attorney)
2012Patent engineer with Keller & Partner Patentanwälte AG
2009Patent engineer with a law firm in Easter Switzerland
2008"Patent Liaison" with an internationally active medical technology company
2007Postgraduate degree in intellectual property (MAS IP), ETH Zurich, and short internship in the patent department of an internationally active chocolate manufacture
2005M.Sc. in Biochemistry, University of Bern