"Beyond Einstein" is a scholarly book that examines the interactions between mathematical and physical research as well as the collaborations among scientists of the 20th century within their academic communities. The book begins with Einstein's general theory of relativity and highlights a series of dramatic discoveries and competing theories in physics that influenced the development of modern differential geometry. Various methods, such as the revival of Weyl geometry, are presented, which geometers have employed to address the problems posed by these innovations in space-time physics. Additionally, the impact of general relativity on astronomy is discussed, particularly how astronomers developed new theories like inflationary cosmology and phoenix models. By incorporating current historical research and connecting different disciplinary perspectives, this text provides a comprehensive picture of general relativity and cosmology throughout the 20th century.