From 1999 she has been a member of five reenactment groups and she took part in many activities of experimental archeology and historical educational festivals. Today she belongs to fellowships reenacting cultures of Celtic and Slavic tribes.

Kathrin is interested not only in material aspects of Celtic culture but also in Celtic spirituality- typical for the old times and modern as well. Her passion is also old Celtic literature which she studies, translates and sometimes comments. She loves dancing, fencing, archery, she also designs and makes costumes and writes poetry.

In 2008 she graduated Medical University of Bialystok. She lives with her husband Kamil Simonienko (dentist, blacksmith, knivemaker and photographer), their small Degu, Cat and two Dogs near beautiful Białowieza Primaeval Forest- the last virgin forest in Europe and the only remaining part of the immense forest which once spread across the European Plain. They spend their free time on survival expeditions, Celtic and medieval festivals, with friends, at home -reading books, playing guitar and singing (sometimes too loud ;) -Kathrin) or somewhere else traveling.

Her illumination works are created in old techniques (watercolors, tempera, gold leaf, ink, dip pen or just feather ) and modern as well (usually enhanced by computer) so they are in painted and digital forms. She also takes pictures and uses some of them for her digital art.

Kathrin has won several prizes for her artwork (i.a. two Golden Harps in two editions of the international ‘Druid’s Head Pub’ Eisteddfod Competition in 2006 and 2007). Her Celtic Art pieces appear in many private collections.