Ogilvy North America, the largest unit of The Ogilvy Group, has hired three executives to expand its marketing expertise.

Chris Halsall has joined the agency as senior partner, global managing director of marketing strategy, a new position. His responsibilities include overseeing global marketing strategy for client IBM. The post took effective this month.

Prior to joining Ogilvy, he worked at McKinsey & Company’s Marketing Practice, and most recently was a partner with the Prophet Brand Strategy.

Also this month, Ogilvy named Robert Schwartz to the new post of executive director of the agency’s E-mail Marketing and Digital Dialogue practice. He’s charged with helping build more robust and data driven solutions to improve clients’ return on investment.

Schwartz joins Ogilvy from Century 21 Real Estate where he was vice president, national marketing. In that role, he oversaw advertising, Website development, online marketing and call center management. Prior to that, he was senior vice president, head of client services for Epsilon Interactive. He also held senior-level client positions at AT&T and JPMorganChase.

Ogilvy also named Michael Dobak as senior partner, worldwide executive marketing director. He is in charge of leading the agency’s brand communications efforts for IBM globally. Dobak joins Ogilvy from Arnold where he spent the last two years building its R&D Lab, and bringing in new clients, Under Armor and Progressive.

Before that, he worked at Hal Riney & Partners working on the Sprint/PCS business. He also worked several years on the client side at Burger King.

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