(1850?–1933), director. Born in New York City to actor parents, he began performing while still a child and subsequently worked with most of the great players of the last half of the 19th century. Seymour started to direct while serving a stint at the Boston Museum late in the century, then moved on to become a principal stager for Charles Frohman and for Liebler and Company. His courtesy to actors and his willingness to follow a playwright's ideas won him wide respect. At the time of his death he was called “the dean” of Broadway's directors.
From The Oxford Companion to American Theatre in Oxford Reference.