During the years (1869-71) the Warrens were in Germany, Herbert attended schools in Gotha and Dresden, and through the next four years studied at Owen s College in Manchester. Following arrival in the U. S. in 1875 he began architectural study at Boston’s "M. I. T.” and following graduation in 1877, spent four years as a student in Harvard's School of Design.
Warren was twenty-four years of age when he secured a position in the office of H. H. Richardson of Brookline, and for five years when that great architect was at the height of his fame, served as his assistant in design.
For a few years after 1895 he practiced in Troy, N. Y., under the firm name of Warren, Smith & Biscoe, later changed to Warren & Smith. In 1890, after being invited to teach Architecture at Harvard University, Mr. Warren closed his office in Troy and returned to Boston, and as Assistant Professor in 1893, promoted to the head of the Department in 1896, he held the Chair of Architecture at the University until shortly before his decease.
An early member of the American Institute of Architects, advanced to Fellowship in 1891, he served on the national Board of Directors several years, and while in Boston was prominently identified with the local Society of Architects.