The agency adds new members from Heat, Airbnb and TBWA.
The Interactive Advertising Bureau announced the lineup for the third annual showcase scheduled for Sept. 7 in New York.
The super group will serve Microsoft as a common client and help clients develop their Amazon strategy.
The company will be responsible for JetBlue's digital experiences, including its responsive site, mobile and tablet applications.
Gallegos hired Harvey Marco to take over as chief creative officer and co-president for Dave Damman, who leaves the agency at the end of July.
Advertisers shied away from the program following the decision to interview InfoWars founder Alex Jones.