Helene Cederroth, Founder and Chair of Wilhelm Foundation, an international non-profit working to end the diagnostic odyssey for People Living With Undiagnosed Diseases (PLWUD). She is co-founder, board member of Undiagnosed Diseases Network International (UDNI) and co-founder Undiagnosed Diseases Network Foundation (UDNF). She founded Undiagnosed Hackathon and Global Undiagnosed Day. For more than two decades, she has led international, multidisciplinary collaborations integrating clinical expertise, genomics, and emerging technologies, with a strong focus on diagnostic equity. Her work is driven by the loss of three of her four children to an undiagnosed disease, fuelling her commitment to ensure no family is left without a diagnosis.