Steve Rudnitsky on Sept. 30 will resign as president and CEO of Miraval Group, Hyatt Hotels Corp. has announced.

His departure is part of the restructuring of the spa and wellness company Hyatt has introduced a new leadership structure for Miraval, which the company acquired in January for $215 million.

Succeeding Rudnitsky will be Marc Ellin, senior vice president of operations, Americas, at Hyatt, who has assumed more responsibilities for Miraval Group, including oversight of operations, sales and marketing. He reports to Rudnitsky for the time being.

Three other Miraval Group executives – Tom Botts, chief marketing officer; Paul McCormick, senior vice president for Miraval operations; and Meredith Nicklas, corporate director of finance – will also resign once transition is complete.

“These leadership changes are natural, evolutionary and appropriate at this time, both for Miraval and the greater Hyatt organization,” said Hyatt Corp. CEO Mark Hoplamazian.

Hyatt acquired Miraval to grow beyond the traditional hotel business. Hyatt operates Miraval as an independent company.