Greg O'Brien was named CEO, Americas, at real estate money manager Jones Lang LaSalle, confirmed spokeswoman Gayle Kantro.
He replaces Lauralee E. Martin, who left the firm in October to become president and CEO of health-care REIT HCP.
Mr. O'Brien reports to Colin Dyer, president and CEO of Jones Lang LaSalle, who oversaw the role of CEO, Americas, following Ms. Martin's departure.
Mr. O'Brien was previously CEO, markets solutions; John Gates will take over the role with a slight title change to CEO, markets.
Mr. Gates was previously president of real estate services, Americas. He will not be replaced and will continue the responsibilities of that role.