Holger Volland and Michael J. Elling Join Our Advisory Board! Gallery Holger Volland and Michael J. Elling Join Our Advisory Board! News, The Sonophilian Holger Volland and Michael J. Elling Join Our Advisory Board! By Sonophilia Foundation|2022-01-30T10:56:18+01:00January 28th, 2022|News, The Sonophilian| The Sonophilia Foundation is excited to announce two new Advisory Board members! Read More Comments Off on Holger Volland and Michael J. Elling Join Our Advisory Board!