Mike Langberg (pictured), the lead columnist for the Mercury News business section, has resigned and will take a position with a marketing and communications agency. Langberg has been at the Merc for 17 years and won numerous awards including the Best in Business award for column writing from the Society of American Business Editors and Writers in 2005. A press release says he is joining the TDA Group, “a high-tech marketing communications agency and custom publishing house,” where he will “oversee and direct a range of marketing programs including custom publications, customer reference programs.” [Langberg’s final column]