[1] Recognized as a leading expert in election law, his work has been cited numerous times by the United States Supreme Court.

[5] He co-invented the efficiency gap, a metric used to measure potential gerrymandering in electoral systems, which quantifies the fairness of districting by calculating wasted votes.

He has also been an Associate-in-Law at Columbia Law School and worked as an associate in the Washington, D.C., office of Jenner & Block LLP.

[7] In the 2023 case Allen v. Milligan, the Supreme Court's decision heavily relied on an amicus brief submitted by the Election Law Clinic, representing Stephanopoulos and other scholars.

[9] It provided empirical evidence about the effectiveness of Section 2 of the VRA and highlighted the potential consequences of undermining this provision, which aims to protect the electoral opportunities for communities of color.