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She was named deputy commissioner of public health for Chicago in 1990 and became commissioner in 1991. Lyne has been a board member for the American National Bank and Trust Company, American National Corporation, DePaul University, El Valor Corporation, Mercy Hospital and Medical Center in Chicago, Mercy Center in Aurora, the Illinois Hospital Association, and the State of Illinois Guardianship and Mental Health Advocacy Commission.

She has won numerous honors, among them the Excellence in Public Service Award from Crain's Chicago Business, North Business and Industrial Council, and Motorola, and the Shield of St. Xavier Award from St. Xavier University.