SANTA MONICA, Calif.--(BUSINESS WIRE)--GumGum, the leading digital marketing platform for the visual web, today announced that John Weisgerber has joined the company as Senior Vice President of Sales. With twenty five years of sales leadership experience, Weisgerber joins GumGum with a track record of building profitable online businesses and driving revenue. Weisgerber’s hire heightens GumGum’s ability to meet the rapidly growing demand for in-image advertising opportunities from both agencies