Analysis of information sources in references of the Wikipedia article "Sinclair Clark" in English language version.
Mr. Horn added a complete, custom tannery to the facility in Mt. Vernon and hired the talents of Mr. Sinclair Clark, the legendary tanner from the Museum of Natural History in New York, to run the tannery.
Over here, a tanner named Sinclair Clark set to work on the skin. In a job that took all day, he sawed the inch-thick hide into three pieces... In a second job that took almost a year, Clark tanned the hide, softened it so it would be pliable enough to work with.