Also, my advisor [Tzuong-Tsieng Moh] did not write me letters of recommendation."[12] Zhang made this claim again in George Csicsery's documentary film Counting from Infinity: Yitang Zhang and the Twin Prime Conjecture[13] while discussing his difficulties at Purdue and in the years that followed.[3] Moh claimed that Zhang never came back to him requesting recommendation letters.[4] In a detailed profile published in The New Yorker magazine in February 2015, Alec Wilkinson wrote Zhang "parted unhappily" with Moh, and that Zhang "left Purdue without Moh's support, and, having published no papers, was unable to find an academic job".[5] In 2018, responding to reports of his treatment of Zhang, Moh posted an update on his website.