Born in the former German city of Schlawe/Pommern, Kathia studied fabric design at the Art College of Hamburg and acting with Joseph Offenbach and Fritz Wagner. In 1962 Kathia had her first solo exhibition at the Bücherhalle Altona and began her intensive involvement in work relating to cruelty to animals. In 1966 Kathia exhibited her works at Atelier Mensch in Hamburg and began doing layout work for a Hamburg publishing company, which she continued until 1971.

Since 1971 Kathia has been a freelance painter and writer. In 1981 she was the recipient of a Silver Medal presented by the Graphikclub-Stuttgart. In 1989 she established a painting school for adults and in 1990 started "Kathia's Sommerakademie" (Summer Academy) in southern Germany. From 1991 through 1993 Kathia did numerous solo exhibitions, including those at Kampen/Sylt, Wiesbaden and Cologne. In March of 1994 her works were exhibited in Frankfurt/Main at the Gallery Donna R. Ms. Berger's work is currently part of the exhibition "Naive Art" at the Stadt Museum in Linz, Austria.

Apart from other exhibitions Ms. Berger has also designed and decorated Arzberg fine china and created a series of wall plates by Hutschenreuther for the "Bread for the World" organization.

Thanks to favourable national and international press coverage Kathia's popularity is rising steadily. By using her paintings during television programs she has succeeded in significantly heightening public awareness of cruelty to animals.