MacDonald received her doctorate in medical biophysics from the University of Toronto in 1980. She is a founding member of the Molecular Neurogenetics Unit and the Center for Human Genetic Research and a member of the Basic Biological Sciences Program at Harvard Medical School. She directs the Molecular Neurogenetics Unit Genotyping Resource and the Chromosome Substitution Strain Resource.
Her research focuses on a molecular genetic approach to understanding inherited human diseases of the nervous system. MacDonald and her colleagues have used genotype-phenotype studies to discover gene mutations that cause Huntington's disease and Neuronal Ceroid Lipofuscinosis.
The late Dr. Arnold M. Clark, who died in 2003 at the age of 87, was a biology professor at UD from 1946-81 and helped launch the graduate program in biological studies. He is known for his support of medical genetics and genetic counseling at a time before genetics was taught in medical schools. Dr. Clark was a member of the Genetics Society of America and the American Society of Human Genetics.







