IRIS Software Group Appoints Marissa Carlson as Chief Marketing Officer to Accelerate Growth and Market Expansion Globally

Jonathan Priestley Takes on New Role as General Manager for Global Accounting Solutions

London, UK, November 3, 2025: IRIS Software Group (IRIS), a leading global software provider of accounting, payroll, HR and education solutions, today announced the appointment of Marissa Carlson as Chief Marketing Officer (CMO). Jonathan Priestley, who previously served as interim CMO, takes on the new role of General Manager, Global Accounting Solutions and Transformation. Overall, these appointments underscore the company’s commitment to delivering customer-centric innovation that enables client success and long-term business growth.

Proven Marketing Leader Brings a Proven Track Record of Revenue Acceleration 

Marissa Carlson, who will assume her role on November 10, will oversee global marketing for the organization. He has nearly two decades of experience growing high-growth businesses and building high-performing marketing teams. A customer-centric commercial executive, Carlson most recently served as CMO at TigerConnect, where he led go-to-market planning and strategic brand repositioning for the company’s unified communications solutions. Previously, Carlson was CMO at Intelerad, where he built global brand recognition and drove the company’s rapid expansion in the US acute care market.

“Marissa is a tremendous addition to our executive leadership team as we enter our next phase of transformational growth,” said Jason Dies, CEO of IRIS Software Group. “She has a proven track record of deeply understanding customer needs, positioning solutions that deliver real value to customers, and building world-class marketing teams that drive results. This is a very exciting time for IRIS. We have significant momentum across our business, and Marissa’s leadership and experience will help us capitalize on future opportunities.”

“Joining IRIS at this crucial time is an incredible opportunity,” said Carlson. “The company has a strong foundation and a talented team across the globe. Together, we are poised to accelerate growth in our core markets of the UK and North America, while expanding internationally and creating long-term value for our customers.”

Customer-Focused Leader to Take on a Global Accounting Role and Build the Foundation of a Critical Market Segment 

Priestley’s new role as General Manager for Global Accounting Solutions and Transformation will drive market strategy, product positioning and commercial enablement for IRIS’ accounting business, which is a cornerstone of the company’s heritage.

“Jonathan’s deep expertise in rolling out our cloud-based solutions in the UK, combined with his close relationships with our accounting clients and unique market perspective, makes him uniquely positioned for this new role,” Dies said. “He will ensure our accounting solutions remain firmly rooted in our customers’ evolving needs, not only driving sales effectiveness and retention, but also ensuring we continue to deliver the innovation and value our clients rely on.” Dies added, “I want to thank Jonathan for his dedicated leadership of our marketing team over the past few months, and I’m very excited about what’s to come.”

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About IRIS Software Group

Founded in 1978, IRIS Software Group is a global provider of cloud-hosted and mission-critical software solutions and services to more than 100,000 customers in 135 countries. IRIS is a trusted partner for business, finance, HR and payroll teams, educational organizations, and accounting firms of all sizes, delivering innovative operational solutions that simplify complex processes, maintain compliance, and unlock growth. By simplifying, automating and providing insight into critical daily tasks for organizations of all shapes and sizes, IRIS ensures customers can look forward to them with certainty and confidence. IRIS is certified as a Great Place to Work® 2024 in the UK, Ireland, India, Romania, Canada and the United States. Follow IRIS on LinkedIn, Twitter and Instagram. Further information regarding the award-winning software solution can be found here.

Media contact:
IRIS Software Group
Jennifer Peters | Associate Director, Public Relations and Communications
[email protected]