Eric Mower + Associates hired Jared Kerschner as a digital developer.

Hall & Partners named Andy Chappin as global chief financial officer.

BrainJuicer Group named Teri Hall as vice president, North America.

AddThis hired Arthur McKinley as director, international business development.

T3 named Jim Firestone as chief strategy officer. Firestone joins T3 from GSD&M, where he was most recently vice president, experience & insights.

Premier Retail Networks named Martin J. Fry as chief operating officer.

Terry Chabrowe, who has served as chief operating officer since eMarketer was founded in 1996, was promoted to chief executive officer, responsible for day-to-day operations and overall strategy.

33Across hired Chung Cheong as vice president of product management and Neil Fried as vice president of business development.

Borders Perrin Norrander elevated Lori Gaffney to president.

FreeWheel hired James Rooke as vice president of advisory services.