 G. Corbett came to Umm el-Jimal in 1956 to study the Julianos Church and much of his work corrected the mistakes made by Butler.Corbett also refined how Umm el-Jimal is thought of today by demonstrating that many of the buildings were constructed reusing pieces from earlier buildings.In 1972 comprehensive work was started at Umm el-Jimal by Bert de Vries of Calvin College.