CHICAGO, Illinois, August 1, 2025– Concert Group Holdings, Inc., (“Concert”), has announced the components of a succession plan designed to prepare the company for its next five years of profitable growth and development.
The plan, which was developed during Q1 of this year, comes into effect today (Friday, August 1, 2025), and includes the following changes to Concert’s management team:
- John Hendrickson will step down from his position as Chief Executive Officer. Hendrickson will remain on Concert’s Board.
- Hendrickson will be succeeded as CEO by Sam LaDuca, currently Concert’s Chief Actuary.
- Matt Wagner, currently Chief Legal Officer and General Counsel, will add the role of President of Concert to his responsibilities.
- Mike Rybak, currently Chief Financial Officer, is scheduled to retire in June 2026 after a 50 year career in the insurance industry. Rybak will step down from his role and will remain available to Concert’s Finance team until his retirement next year.
- Katarina Scamborova, currently President of Harmony Re, will succeed Rybak as Chief Financial Officer. Scamborova retains her role as President of Harmony Re, Concert’s risk retention vehicle.
“Our succession plan coincides with impressive operating performance, increasing market interest in partnering with Concert and significant growth in the fronting market,” said Concert Chair Charles Slatery. “Over the last two-plus years, John, Matt and Sam have collaborated closely to build a resilient operating, governance and risk management foundation which positions Concert well to deliver on our management’s ambitious plans for the next five years.
“Since its formation in 2021, Concert has assembled a top-tier leadership team that has navigated the company successfully through various market challenges, overseen the integration and development of Harmony Re as an innovative solution for risk retention in the fronting sector, and championed a singular set of values central to an enterprise committed to operational integrity.
“We are grateful for all that John has contributed to Concert since assuming the position of CEO two and a half years ago. We also greatly appreciate that both Mike and John will be available to provide ongoing support to their successors to ensure a smooth and orderly transition.”
“I have genuinely enjoyed my time as Concert’s CEO,” said Hendrickson. “It has been challenging and gratifying in equal measure. The quality of the people working at Concert, and their commitment to its future, give me confidence that the company is destined for long-term success.
“Needless to say, I am delighted that Sam LaDuca is succeeding me as CEO. With more than 30 years’ experience, Sam’s depth of experience, his analytical mindset, and his collaborative nature make him ideally suited to lead Concert during its next stage of growth and development.
“Since joining Concert in March 2022, Sam has made a significant contribution, earning the respect and admiration of Concert’s Board of Directors and company employees. With Sam at the helm, I have no doubt about Concert achieving its goal of becoming a leading hybrid fronting carrier.
“It would be hard to overstate the value Matt Wagner has brought to the company. His perseverance, resilience and stewardship are unwavering. These traits have shone through during any number of issues facing Concert. Matt is the epitome of what Concert strives to attain: excellence in every regard, with a decency, integrity and
compassionate humanity that are the hallmarks of his leadership.
“While Katarina Scamborova is stepping into the very experienced and capable shoes of Mike Rybak, there’s no doubting she’s up to the task. The work Katarina has done in bringing Harmony Re to market has been impressive. In addition, in working with Sam to develop our go-forward plan, she has deep, cross-functional insight across Concert’s operations and will lead the continued development of the Finance function with acumen and foresight.
“Katarina will benefit from the excellent foundation built by Mike and Scott Stosek, Concert’s Director of Finance. Scott and Katarina already have a well-established relationship, given Scott’s additional role as Harmony Re’s CFO.”
About Concert Group Holdings, Inc.
Concert Group Holdings, Inc. is a privately owned insurance holding company, which, through its wholly owned subsidiaries, Concert Insurance Company® and Concert Specialty Insurance Company®, offers insurance fronting and related services in the United States. For more information, please visit www.concertgroup.com.
Media contact:
Wendy Davis Johnson
wendy@wendydavisjohnson.com
Editors’ Note:
Please find bios for Sam LaDuca, Matt Wagner and Katarina Scamborova.
Sam LaDuca
Sam LaDuca joined Concert in March 2022 after 25 years with Merchants Insurance Group. During his tenure at Merchants Insurance, LaDuca was promoted to increasingly senior positions, the most recent being Executive Vice President, Product, Underwriting & Actuarial. In addition to his responsibility as the company’s Chief Actuary, he held senior leadership roles in product management, corporate programs, corporate underwriting and finance.
Prior to Merchants Insurance, Mr. LaDuca worked for three years at PricewaterhouseCoopers (formerly Coopers & Lybrand) as a Senior Consultant in the firm’s Casualty Actuarial/Risk Management practice.
He is a Fellow of the Casualty Actuarial Society and a member of the American Academy of Actuaries and holds the Chartered Property Casualty Underwriter designation.
Matt Wagner
Matt Wagner has over 23 years of experience in the P&C insurance industry. He joined CEM Insurance Company (CEMIC, now Concert Insurance Company) as General Counsel and Chief Operating Officer in 2002. In 2012, he assumed the role of President responsible for all operations including managing growth, strategy and financial
performance.
Prior to joining CEMIC, Matt practiced law in Chicago working nationally in the areas of commercial litigation, aviation & space, cargo, marine, products liability, construction and reinsurance, as well as insurance coverage, regulatory and compliance.
Matt received his Juris Doctor from the University of Illinois Chicago School of Law and is licensed to practice law in the State of Illinois. He completed the Kellogg Management Institute at Northwestern University’s Kellogg School of Management and holds a Bachelor of Science degree (Aviation Management) from Southern Illinois University.
Katarina Scamborova
Before assisting Concert with Harmony Re’s formation, Katarina Scamborova was Managing Director, Swiss Re Corporate Solutions where she also served as a board member of its North America underwriting companies.
Scamborova’s career experience includes seven years at AIG as a senior executive in the General Insurance business segment and two years at McKinsey & Company where she was P&C Insurance Industry Leader.
Scamborova holds a Master of Business Administration (Dean’s List) from The University of Chicago Booth School of Business and the Chartered Property Casualty Underwriter (CPCU) and Associate in Reinsurance (ARe) designations.