Although, by all appearances, Mender Roebuck resembles a 19th-century businessman, he is a little bit more than that.
As a Mender, he has knowledge to certain secrets of time and space. But that is not all that he knows.
He knows things that Menders shouldn't. Things that are crucial to the stability of the Omniverse itself.
For most other people, this would make him dangerous. Thankfully he's not like most other people.
Mender Roebuck knows how to keep a secret, and he also knows how to use that secret in a way that keeps it intact.
(Please see his Paragon Wiki entry for more information.)
Mender Roebuck is reportedly patterned after Alvah Curtis Roebuck, the founder of the Sears, Roebuck, and Company department stores.