In the mid-1960s, Dan decided to devote most of his time to technical writing and editing. He was the author of over 500 published works including articles, technical papers, and books, and also edited hundreds of books including a series of 91 practical construction guides published by John Wiley & Sons and McGraw-Hill. Morris was the founding Editor of the ASCE Construction Division Journal, served as Chairman of the Construction Division, and was the recipient of the Peurifoy Construction Research Award from ASCE in 2001. He also taught more than 700 technical writing courses to thousands of engineers over a span of four decades.

Although he became a longtime resident of Ithaca and later served as president of the ASCE Ithaca Section, Dan regularly kept in touch with the Met Section officers and often visited the New York City area, keeping up to date on local ASCE activities in the metropolitan area.