CHICAGO — Jack Modzelewski has retired after a 26-year career with FleishmanHillard, during which he served in several leadership positions as one of the Omnicom firm's senior partners.

Modzelewski, who spent the past year as global president of business development and partnerships, previously served as Americas president for almost five years, during the tenure of global CEO Dave Senay. His existing responsibilities will be divided among the firm's senior leadership team.

Senay was replaced by John Saunders in late 2015, who elevated JJ Carter to regional leadership of the Americas one year ago. Saunders paid tribute to Modzelewski's lengthy career with Fleishman, which also included an eight-year stint overseeing global client relations and five years in charge of EMEA

"Jack has been instrumental in the growth of FleishmanHillard, serving FH well in his many leadership positions since 1990," said Saunders. "Jack’s contributions throughout his career – in the way of strategic leadership, business relationships, and elevating FH’s reputation – long will be appreciated. And along the way he’s been generous with his time in never hesitating to offer his best advice and support to his fellow FHers."

Modzelewski joined Fleishman in 1990 to found its Chicago office, spending nine years in the role before being promoted to oversee EMEA, where he ultimately tripled revenues and significantly expanded the firm's footprint across the region .

Saunders noted that Modzelewski's decision to retire will see him spend more time on public and civic service, particularly with organizations assisting the economically less fortunate. Modzelewski also plans to finish writing a business book and will remain engaged in business and professional education.