Maris Stella Mueller, who managed the offices of Baltimore physicians, died after a fall Nov. 3 at her home in the Mercy Ridge Retirement Community in Timonium. She was 91 and had lived on Pratt Avenue and in Parliament Court.

Born in Baltimore, she was the daughter of John Locke, a musician who had a program on WFBR-AM radio, and his wife, Maris Stella Hennegan, whose family owned Thompson’s Sea Girt House on the Canton waterfront.

After her mother’s death when she was 2 years old, she was raised by her aunt, Alice Hennegan.

She grew up on Dunkirk Road in Rodgers Forge, attended Immaculate Conception School and graduated from Mount Saint Agnes High School and Villa Julie College, where she studied medical office administration.

She met her future husband, J. Kevin Mueller, at Baltimore’s old Century Theater. They married in 1953 at Immaculate Conception Church in Towson and settled in a home on Blenheim Road.

Mrs. Mueller became a medical secretary and worked in the field for more than 50 years. She worked for Drs. John Parsons, William Hobson Woody, Norman R. Freeman Jr. and Robert Vissing.

While running the office for Dr. Freeman, a physician to the Baltimore Colts, she scheduled appointments for the team’s players.

“She was a Renaissance woman,” said Dr. Robert Vissing. “She ran our office with efficiency and charm. She had an incredible memory for patients’ names, and the names of their spouses and children as well.”

“She loved the people who sought medical treatments and became a kind of doctor to them herself. She made them feel good about themselves,” said her son, the Rev. Kevin A. Mueller. “Her patients became her friends, and so did their children. The first thing she said was, ‘What can I do for you?’”

He added that she had the ability to navigate medical insurance claims and made sure patients received proper insurance compensation. She was also skilled at transcribing physicians’ notes recorded on old dictaphone machines.

Mrs. Mueller had been a member of the Cathedral of Mary Our Queen parish and ran social events for the congregation. She had also been active in the Visitation Academy Parents’ Club.

“Maris Stella was a dynamo,” said Frances Rankin Wroblewski, a lifelong friend. “She had a heart of gold and was always helping people. She was neat as a pin and the epitome of fashion. Our Mount Saint Agnes yearbook called her a ‘Peter Pan in organdy.’”

Survivors include her daughter, Laura “Laurie” Mueller Smith, of Timonium; two sons, Rev. Kevin A. Mueller, pastor of Our Lady of Hope and Saint Luke parishes in Dundalk, and Denis R. Mueller, of Port Deposit; a sister, Mary Joe Daniels, of Newtown Square, Pennsylvania; and five grandchildren. Her husband, Joseph Kevin Mueller, an administrator in the Maryland Department of Assessments and Taxation, died in 2009.

A funeral Mass will be held at 10 a.m. Friday at Stella Maris Hospice Chapel, 2300 Dulaney Valley Road in Timonium.