Salt Lake City -- Overstock.com, Inc. has promoted Seth Marks to the position of senior VP of merchandising and strategic sourcing for the online shopping site. Marks began his work at Overstock.com in 2013, and has served as VP of sales and special acquisitions. Previously, he co-founded Big Lots Capital, the special acquisitions arm of Big Lots, Inc., and served there as the VP of merchandising.  He also was chief marketing officer and Acquisition Group president of Tuesday Morning Corp.