Ann T. Heller, 89, formerly of Rosemont, a retired Bell Telephone Co. of Pennsylvania communications engineer, church organist and choir director, died Thursday of pneumonia at Bryn Mawr Terrace.

Miss Heller grew up in West Conshohocken and started playing the pipe organ at St. Gertrude's Church in Conshohocken when she was 11, said her sister Elizabeth A. Melroy. She graduated from St. Matthew's High School in Conshohocken.

In the late 1930s, she moved with her family to Rosemont and went to work as a telephone operator with Bell in Bryn Mawr. She was promoted to supervisor in Bryn Mawr and modeled for Bell's print advertisements.

By the late 1940s, Miss Heller had a supervisory position in Bell's main office in Philadelphia. She retired as a communications engineer in 1982.

On Sundays, she played the organ and conducted the choir at Mass for St. Thomas of Villanova Church. She also played for funerals and weddings, and taught piano to neighborhood children and to her nieces and nephews. She played the organ and planned music programs at the St. Thomas parish churches in Rosemont and on the university campus until the early 1990s, her sister said.

Miss Heller was a volunteer for the American Red Cross of Southeastern Pennsylvania and was an active member of the Telephone Pioneers of America.

She is survived by her sister and nieces and nephews.

A Funeral Mass will be said at 10 a.m. Tuesday at St. Thomas of Villanova Church on the Villanova University campus. Friends may call from 9 a.m. Burial will be in Calvary Cemetery, West Conshohocken.