Dr. Overesch received her veterinary degree in 1993 from the University of Veterinary Medicine Hannover, Germany. Her doctoral thesis (PhD equivalent) in the field of veterinary immunology of the University of Veterinary Medicine Hannover was finished in 1996. Afterwards, she worked as assistant in a private veterinary diagnostic laboratory, which is specialized on equine microbiology. In 2000, she take up a new challenge to the field of food safety and hygiene as a scientific officer at the Department of Food Microbiology, National Agency for Consumer Protection and Food Safety of Lower Saxony, Germany. She worked more than seven year in this area, changing meanwhile to the Department for Food of Animal Origin of the National Testing and Analysis agency of Rhineland-Palatinate, Germany, where she became head of the division for microbiology and molecular biology. In 2008, she took over the position as head of the center for zoonoses, bacterial animal diseases and antimicrobial resistance (ZOBA) at the Institute of Veterinary Bacteriology, University of Bern, Bern, Switzerland. This is an accredited laboratory harboring a diagnostic unit and several Swiss national reference laboratories. In 2018, the ZOBA was restructured and as head of the subdivision reference function and antimicrobial resistance monitoring she now concentrate on the international tasks of the Swiss Reference Laboratories.
Dr. Overesch supervise master and doctoral students and is involved in the teaching of veterinary students in the field of microbiology.
Dr. Overesch is committee member of the VetCAST (Veterinary committee for susceptibility testing) subcommittee of EUCAST since 2018 and active member of the European study Group on Veterinary Microbiology (ESGVM).