Klaus joined the Multiple Sclerosis (MS) community as a volunteer when his spouse was diagnosed with MS in 1988. Since 2015 Klaus has been a member of the European Multiple Sclerosis Platform (EMSP) Executive Committee.

After the diagnosis of his wife, Klaus decided to fight against the disease first as caregiver, then as a volunteer for the Flemish MS Society.

After getting involved with the Flemish MS Society, Klaus got elected as president of the organization. After his retirement, he remained an active member of the board in both the Flemish and the National Belgian MS Societies.