Located on a scenic 54-acre property in Berwyn, the Upper Main Line YMCA Environmental and STEM Education Complex offers seasonal programming, summer camps and special events as well as outreach activities and field trips. 

The grounds are open from dawn to dusk, seven days a week for exploration of our walking trails of the preserve. 

Our Facilities 

More Information about the UMLY Environmental and STEM Education Complex

Our History

The Cassatt Mansion was built in 1906-1908 as part of the Cassatt family’s 120-acre summer country estate known as “Kelso”. 

J. Gardner Cassatt, a successful banker in Philadelphia, had the estate built as a summer country home, which included the mansion, carriage house, garage, barn and several outbuildings. Cassatt’s daughter, Ellen Mary, and husband Horace Hare, later took ownership of the estate and raised their two children, Gardner and Ellen Mary, here through the 1940s.

The estate was sold in 1950 to the Daylesford Abbey, a Norbertine community of Catholic priests and brothers.

The Daylesford Abbey operated on the campus from 1950 until 1961, when they moved to their current location just down the road. 

The Upper Main Line YMCA started in 1962, operating from the T/E Middle School gymnasium. The Y purchased the former Cassatt estate from the Daylesford Abbey and began serving the community from the campus in 1964.

Meet our Team

Meet Michelle!

Environmental and Stem Director at our Upper Main Line YMCA, Michelle Lampley.

Michelle Lampley

Environmental & STEM Education Director

610-647-9622, ext. 2013

Michelle has been with the Upper Main Line YMCA for 13 years. She began her career with the Y as the lead animal technician, where she was responsible for husbandry, educational programming and training of the center’s 35 animals. Michelle is currently the director of environmental and STEM education.

Michelle studied at World Bird Sanctuary and Avian Behavior International. She is a member of the International Association of Avian Trainers and Educators. Previously she was a trainer and educator at Audubon of Mid-Atlantic (formerly Audubon of PA).

Before moving to Pennsylvania, Michelle was a new business development manager for the McClatchy Newspaper group in South Carolina. At McClatchy, she also worked with Newspapers in Education at area elementary schools. She holds a bachelor’s degree in journalism/public relations from Kutztown University. Michelle is passionate about animals in environmental education and reaching students from all over Chester County.