Hi Dave, Been a while since your post but wanted to share this information with you from Sherri at Trinity...
"Doug Gordon tells me that Aickin and Isaac of Philadelphia designed and installed the stained glass windows in the main church.He's not sure who did the windows in the Chapel, since it was done much later."
Sherri Trinity Episcopal Church 844 West Fourth Street Williamsport PA 17701
I see that he and his father were listed in a 1903 Biography of Who is who...I don't recall off hand the exact name of the book but Googled it. In a more recent publication by Robert O. Jones of the Stained Glass Association of America, titled "Biographical Index of Historic American Stained Glass Makers" Under Aicken, Thomas G. it reads:
Active 1881 - 1887, Philadelphia, PA. Worked with Alfred Godwin (Information from Helene Weis...now deceased)
Robert Jones would be a good person to update any information regarding the work of your relative as he is a professional historian on the subject of American Stained Glass
I am researching an American stained glass artist born and (I believe) apprenticed in England by the name of Stephen Slack (B:1837 D:1908). His studio was in Orange NJ with some shorter termed offices in Newark and NY City. Though his primary business name was S. Slack & Co., he also worked with Joseph Waterhouse (Newark), Issac Baldwin (Orange) and Charles Booth (Orange and NY). The other firm names he was listed with are Waterhouse & Slack and Slack Booth & Co. In Philadelphia he and his partner Booth installed the windows at 19th Street Baptist Church, Kearsley Retirement Community and a few more if you are interested I can share. S. Slack & Co. also won awards and medals at the 1876 Centenniel in Philadelphia. I am also interested in finding any information to further my research on Stephen Slack and any of the firm names or partners he worked with. Best of luck to you! Marlena