David Carberry, previously with Advertising.com and CBS Radio and WMAR-TV, launched Enradius, a digital marketing company based in Ellicott City that uses geo-targeted marketing and behavioral data to help clients reach their customers. Enradius already counts a range of Baltimore-based non-profits and businesses in its client roster, including Princeton Sports, Edward Arthur Jewelers, Bel Air Dental, Chesapeake AED Services and the William E Proudford Sickle Cell Fund.

Baltimore-based mobile ad company Millennial Media announced that former Apple executive and Burstly Chief Technical Officer Ben Widhelm joined the company to lead the technical direction and execution of its data management platform (DMP).

Zest Social Media Solutions hired Andrew Rose as president to lead the Towson-based marketing agency. He joins the company after spending the past decade as director of marketing and business development at the accounting firm Naden/Lean. Zest was founded by Ali Lemon in 2009, who worked for Rose as a marketing coordinator at Naden/Lean prior to launching the company.

Smyth Jewelers, with locations in Timonium, Annapolis and Ellicott City, has chosen Baltimore’s TBC Inc. as its new ad agency after 12 years with MGH Inc., according to a report in the Baltimore Business Journal. “While they’re selling jewelry, they’re really in the business of marketing romance,” TBC chairman and creative director Allan Charles told the BBJ. “We want to make them synonymous with romance.” TBC is currently working on television spots that will likely begin airing in early 2015, while other ads will include digital, print and other media. “We didn’t have any sense that there were any serious issues,” MGH President Andy Malis said. “It doesn’t surprise me after 12 years that you might want to shake things up a little bit.”