Definition 6 has hired Bob English to run its motion design group in New York as creative director.
Jared Folkmann and Christiaan Welzel, previously of Sid Lee, joined Critical Mass as planning director and associate creative director, respectively.
Gotham Direct hired Adam Krumwiede as executive vice president, group media director.
Arnold Worldwide hired Matt Belson as vice president, account director for the global Dell brand. Belson joins Arnold from Young & Rubicam in New York, where he most recently served as global account director for Dell.
Sundance Channel hired Michael Lehrer as vice president, strategic marketing. Prior to this role, Lehrer served as senior director of integrated marketing and sponsorship development at MTV.
LevLane hired Kimberly Neff as account coordinator on the agency's Senior Care Development and Philadelphia Corporation for the Aging accounts. Previously, Neff was account manager at Red Tettemer, Philadelphia.
Mike Loftus joined Allen & Gerritsen as director of business development.
Datalogix hired Joe Kyriakoza as general manager, DLX Automotive.
R/GA hired Russell Davies as head of planning for its London office.
Digital Broadcasting Group hired Joe Epstein as chief marketing officer. Epstein joins DBG from Sony Pictures Entertainment, where he served as vice president of digital marketing.
DDB Chicago hired Azher Ahmed as senior vice president, director of digital operations. Ahmed joins DDB Chicago from The Martin Agency, where he served as senior vice president, director of technology.
ChoiceStream hired Eric Bosco as chief operating officer. Most recently, Bosco served as chief product officer at comScore.
Time Warner Cable hired Bobby Amirshahi as vice president of communications for New York City.
Mercury Media named Shayne P. Forrester as vice president of new business development.
Ken Hicks joined The Marketing Store to lead its client services team and grow its retail and shopper marketing programs.
Digital agency 360i hired Mark Avnet as dean of 360iU, the agency's newly launched education center. Avnet most recently served as professor and chair of the creative technology track at the VCU Brandcenter, part of the VCU's School of Mass Communications.