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.

Brian L. Perkins has joined Mekanism as senior creative and director.

Angela Herbst rejoins PJA Advertising + Marketing as group account director. Herbst rejoins PJA from Boston-based Hill Holliday where she was a management supervisor working on the Bank of America account.

Jason Ambrose is returning to CP+B as creative director. Ambrose will be based in the agency’s Los Angeles office.

Canaan Partners promoted Dan Ciporin to general partner.

LevLane hired Elise Brown as account supervisor on pr accounts including Beneficial Bank, West Chester University, WXPN and Reliance Standard Life Insurance.

Carat hired Mike Vitti as senior vice president, group director, data and analytics to oversee the agency's data and analytics practice.

The Madison Square Garden Company named Irene Baker senior vice president, government affairs.

MSG Entertainment named Robin Korn as executive vice president of strategic marketing.

Borders Perrin Norrander elevated Lori Gaffney to president.

Firehouse appointed Sarah Avery as public relations director. Most recently, she was director of corporate communications for Caelus Energy.

BlueKai hired Cory Treffiletti, as senior vice president of marketing. Most recently, Treffiletti was president of Catalyst S+F.

Digital Operative hired Matt Browne as vice president of marketing.

Trina Arnett, former head of analytics at Crispin Porter + Bogusky and Mullen, has launched her own consulting firm to help clients make sense of their data and link it to strong business results.

Baldwin&, Raleigh hired Emily Kissee as account supervisor on Burt’s Bees. Titles at Baldwin& are self-assigned and Kissee’s will be “Hot Sauce.”

Vibrant Media named John Haskin as vice president of marketing.

StumbleUpon hired Cody Simms as vice president of product.

FreeWheel hired James Rooke as vice president of advisory services.

Take2Media hired Jay Farrell as president.

Tim Wettstein was promoted to group creative director of JWT Atlanta. Wettstein joined the agency earlier this year as a creative director.

The Weather Channel Companies hired Bryson Koehler as chief information officer.

Catalog Spree hired Arnaud Collin as chief marketing officer.

PointRoll promoted Bob Shaffer to vice president of east coast sales.

Modern Luxury named Greeven Cuomo as editor in chief of Manhattan and James Aguiar as national fashion director for 40 Modern Luxury magazines.

GLO Gaming hired Josh Pearlstein as account manager and Kyle Hartman as senior account executive.

HealthGuru hired Adam Oppenheimer as account manager.

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

Mirror Image Internet named Charles White as chief revenue officer.