Diffusion, a London-based PR and Communications agency, has launched its first international office in New York. A four-strong Madison Avenue team will implement campaigns across traditional and social media channels for brands in the consumer, technology and mobile space. Diffusion’s three launch clients include mobile phone recycling pioneer SellCell.com and mobile software specialist Antenna. The agency’s US operations will be led by Diffusion co-founder Ivan Ristic and supported by Dan Tudesco, who is a new addition to the team. (Release)

Marketwire has announced the appointment of three new members to its management team: James Delaney becomes Marketwire’s chief operating officer; Jeff Bennett has been appointed senior vice president, client experience; and Victoria MacDonald is the company’s new vice president of human resources. (Release)

Harvey Kipnis has been named CEO at G2 USA. Kipnis most recently served as regional director for OgilvyOne North America; he was also chief growth officer for Ogilvy North America, and he spent 11 years in various positions at Digitas. (AgencySpy)

Jen Nedeau will join Bully Pulpit Interactive as a director on Monday. She has worked in publishing, new media and issue advocacy, and recently spent two and a half years at Time Inc. working on digital strategy and public relations for Time, Fortune, CNNMoney and Money. (Homepage)

Lindsey Benoit has been named director of communications at Women’s Health. She had been associate director at SELF. (mb)