William Cooper and his wife Jane Elizabeth had no children but focused their attention on their niece, Mary Johnston who lived with her father, William Alexander Johnston, just down Albion from the Procters.

Mary was a woman of great achievement and adventure. She was a battlefield nurse in WWI and collected impressionist artworks in Paris around that time. Mary studied education under Maria Montessori in Rome. She worked with missionaries in the Philippines. She was also an artist and farmer.

She had several residences including a farm but she kept her impressionist art treasures at her home on Albion, built by her father. When she was away it was common knowledge that her house key was under the front door mat.

Upon her death, she bequeathed all of her art, the Johnston Collection to the Cincinnati Art Museum. It can be seen in the modern art section on the second floor.

As the heir of much of the W. C. Procter estate she was charged with seeing to it that the money was spent to benefit the Episcopalian church and the public in general. Her uncle always admonished her to be generous in all she did.

Possibly her crowning achievement was the donation of Procter Hall to house the University of Cincinnati College of Nursing.