Differential Brands Group Inc. announced that Andrew Berg has joined Robert Graham as its President. Before joining Robert Graham, Mr. Berg held the position of Senior Vice President of Menswear at Theory, where he led the global Theory Men's organization to significant sales and profit growth across the wholesale, retail, ecommerce and international channels. Mr. Berg refined and elevated the brand's positioning and launched new product categories including footwear, accessories, formalwear and Theory+.