On 14.11.2018 Prof. Keller. was awarded a honoris causa of Wrocław University of Environmental and Life Sciences (Uniwersytetu Przyrodniczego we Wrocławiu), Poland, by President Prof. Tadeusz Trziszka.
On 14.11.2018 Prof. Keller. was awarded a honoris causa of Wrocław University of Environmental and Life Sciences (Uniwersytetu Przyrodniczego we Wrocławiu), Poland, by President Prof. Tadeusz Trziszka.