O'Neill married Roberta LeBrou, of a prominent Baltimore family, in 1890 at the Church of the Immaculate Conception in Baltimore (not to be confused with Immaculate Conception parish in Towson). The couple lived at 1731 Park Avenue, in Bolton Hill. They had no children, but Mr. O'Neill's sisters (and possibly one brother) shared the home. The house today has an historic plaque marking O'Neill's occupancy. The O'Neills were members of the Corpus Christi parish in Bolton Hill. This church was originally called the Jenkins Memorial Church, one of a very few "memorial" Catholic churches in the U.S. dedicated to an individual or family. The Jenkins family was a socially prominent, wealthy old Maryland family. A devout Catholic, O'Neill was said to attend Mass daily, and he became close friends with Archbishop (later Cardinal)
James Gibbons, the best-known American Catholic leader in the early 20th century. One report has an employee of O'Neill's store recalling that the Cardinal would occasionally walk up Charles Street from the Basilica of the Assumption to visit with O'Neill. O'Neill's ambition was matched by a personality of considerable charm. His bright red hair earned him the nickname "Pinky". He was known for standing at the front door of his store, attired in an elegant morning suit, greeting his customers by name and ensuring that each received outstanding service. He apparently retained a touch of Irish blarney and a hint of brogue throughout his life. O'Neill became a prominent business leader in Baltimore, serving on many professional committees to advance the city's business interests. He made most of his fortune by astute real estate investments in the city center, including building The Professional Building at 329 North Charles Street. After his death, when the bulk of his estate was handed to the
Archdiocese of Baltimore and held for decades until building of the new Cathedral began in the mid 1950s, the records held in the AOB archives show the O'Neill trust included multiple properties throughout the city. O'Neill was also a generous donor to multiple causes, the majority connected to the Catholic Church, such as St. Mary's Industrial School, but also for organizations such as the
Maryland School for the Blind. The Memorial Chapel in the
Cathedral of Mary Our Queen includes an image of O'Neill in one window, holding his prayer book and a copy of his will, (the other is located in the corridor leading to the
Sacristy) and a painting behind the altar that reflects elements of O'Neill's life, including the 1904 fire threatening his store, and two famous alumni of St. Mary's,
Babe Ruth and
Al Jolson. ==O'Neill's death==