Lothar is a long time volunteer contributor to LibreOffice and its predecessors. With his company .riess applications he is over 20 years in the migration business with experience in medium and large projects for customers in public and private affairs. he co-developed the certification activities around LibreOffice technology and is nowadays the co-chair of the certification committee. During the pandemic he was the chairman of the board of The Document Foundation. He also is a board member of the Open Source Business Alliance and lobbying for digital sovereignty in private sector and public affairs.