Hildegard has been a student of Ven. Ajahn Tong Sirimangalo since 1992.
In 1993 she started to teach in addition to running her shop for natural nourishments. Since 1994 she organised meditation courses for Ven. Ajahn Tong and Thanat and Kathryn Chindaporn in Germany, France, Slovenia and Sweden. During these classes she assisted the teachers.

In 1998 Ven. Ajahn Tong authorised her as vipassana teacher and gave her the name Dhammacari. Since then Hildegard teaches vipassana on her own. In 2004 she gave up her worldly professional life completely.

The Dhammacari Vipassana Meditation Center was founded in 2006 in Sonental (near Munich). Since then Hildegard has been living and teaching there.
In 2010 Hildegard received an award for her support in Buddhism and it’s teaching in the world from the governer of Chiang Mai province in Thailand.

The Dhammacari Vipassana Center is situated in Sonnenthal near Allgramsdorf/Rottenburg on Laaber. It is embedded in the hilly countryside of Lower Bavaria, Germany. This quiet spot offers ideal conditions for meditation.