High Quality Content by WIKIPEDIA articles! Longfellow, Alden & Harlow (later Alden & Harlow), of Boston, Massachusetts, and Pittsburgh, Pennsylvania, was the architectural firm of Alexander Wadsworth Longfellow, Jr. (1854–1934), Frank Ellis Alden (1859–1908), and Alfred Branch Harlow (1857–1927). The firm, successors to H. H. Richardson, continued to provide structures in the Romanesque revival style established by Richardson that is often referred to as Richardsonian Romanesque.