Teddy Einstein was struck and killed by a car while riding his bicycle in Delaware County, Pennsylvania, on December 3, 2025. Teddy was a beloved husband to Ruth Fahey and father to six year old Charlie and two year old Lorcan Einstein. He was a brilliant mathematician who earned his PhD from Cornell University and taught at the University of Illinois, the University of Pittsburgh, and Swarthmore College. He loved brewing beer, cooking, and hosting parties. Friends remember his warmth, his wit, and his generosity. He was passionate about bicycling and worked to make the Philadelphia area safer for cyclists. Most of all, Teddy was dedicated to his family.

This page is seeking to raise money for funeral expenses, and medical and legal expenses related to the crash. All funds will go directly to Ruth. Any extra funds raised will go towards college accounts for Charlie and Lorcan.

Even more than financial support, Ruth, Charlie, and Lorcan need your care and companionship during this difficult time. If you are able to deliver a meal to the family or provide childcare, please go to this carecalendar link . After requesting a login PIN, you can sign up to help. Please support the family any way you can.