Joshua Horwitz established the Susan M. Clonan Quasi-Endowed Graduate Fellowship for Diversity in Engineering in memory of his aunt in June 2021 and amended the fund in October 2024. The fund is now known as the Susan M. Clonan Quasi-Endowed Graduate Fellowship in Engineering. It provides support for graduate students in the A. James Clark School of Engineering for the purpose of diversifying the student body in all manners in engineering.