Health records can be a rich source of data that can help provide an understanding of a rare disease and drive the development of therapies to treat them. But the siloing of this data, the use of inconsistent terminology, and the unstructured nature of aspects of these records all stand as barriers to harnessing their potential. The consumer health technology company Ciitizen is working to give patients greater control over their own health data and enable its sharing with researchers and providers. We spoke to Nasha Fitter, vice president of rare disease for Ciitizen, about her own experience as a mother of a child with a rare neurologic condition, her work as a rare disease advocate, and a collaboration between a group of rare neurologic disease advocacy organizations to build a natural history study on the Ciitizen platform.