Mike Keszler practices homeopathy since 1986. He took a three-year course with Dr. Roger Morrison, Dr. Bill Gray, Dr. Jonathan Shore and Dr. Nancy Herrick.

He is co-founder of Homeopathy Forum in Germany and since 1997 he is a lecturer at the Academy of Homeopathy in Gauting. He is the representative of Germany in the Committee of the Amsterdam Conference "Crossing Bridges".

He has published many articles in professional journals and has given lectures and seminars in the country and abroad.

He organizes seminars of homeopathy with Dr. Mahesh Gandhi (since 2006), live cases seminars with Rajan Sankaran (since 2009) and interactive workshops with live cases in Winterthur and Mannheim (since 2010).