Mary Jane Trolinger, a retired registered nurse who was one of the original staffers of Johns Hopkins Hospital's Columbia Medical Plan, died Friday of pneumonia at her Ellicott City home. She was 89.

The daughter of a newspaper advertising salesman and a homemaker, the former Mary Jane Garrison — she never used her first name, family members said — was born in Queens, N.Y., and raised in St. Petersburg, Fla., and Tampa.


After graduating in 1940 from Henry B. Plant High School in Tampa, she earned a bachelor's degree in zoology in 1944 from Florida State College for Women, now Florida State University.

Mrs. Trolinger worked in Washington for the U.S. Government Map Service in 1944-1945, and then entered the Johns Hopkins School of Nursing, from which she received her bachelor's degree in nursing in 1948.

In 1948, she married William P. Trolinger Jr., a mechanical and electrical engineer, and the couple settled in Ellicott City in 1955. He died in 1993.

Mrs. Trolinger returned to nursing in 1965, and four years later, was one of four nurses — three women and a man — to staff Johns Hopkins Hospital's Columbia Medical Plan, one of the first HMOs in the nation. She retired in the early 1980s.

From 1985 to 1995, she was project manager for the Ellicott City Restoration Fund, which assisted in the city's revitalization efforts.

She was also a founding member of the Howard County chapter of the American Association of University Women. She was an active member of the Huguenot Society and Colonial Dames. She had been a docent at Mount Clare, the 1760 Southwest Baltimore home that had once been the residence of Charles Carroll, the Barrister.

Mrs. Trolinger was a member of St. John's Episcopal Church, 9120 Frederick Road, Ellicott City, where funeral services will be held at 10:30 a.m. Thursday.

She is survived by four sons, William P. Trolinger III, John M. Trolinger and Robert S. Trolinger, all of Ellicott City, and Benjamin H. Trolinger of Columbia; two daughters, Martha T. Wallis of Herndon, Va., and Charlotte P. Trolinger of Boulder, Mont.; a brother, Charles P. Garrison of Tampa; six grandchildren; and a great-grandson.