Management Team
Jeffrey D. Hibbard - Chief Executive Officer
The driving force behind the formation of IntervalZero, Jeff led the acquisition of the former Ardence embedded technology business from Citrix Systems in June 2008.
Jeff brought more than 20 years of executive management, corporate and product strategy, sales, marketing, and engineering expertise to IntervalZero, which has seen steady revenue and customer growth worldwide under his leadership.
Jeff was the catalyst for the rapid revenue growth of Ardence’s enterprise software business and was the architect of that company’s 2007 acquisition by Citrix. As Ardence’s Vice President of Marketing Jeff drove the 100+% annual revenue growth of the company’s enterprise software business from 2003 through 2006. After leading the successful sale of Ardence to Citrix, Jeff headed the integration of Ardence’s virtualization and software-streaming technology into the Citrix product portfolio.
Jeff joined Ardence – then VenturCom – in 2003 as the company was launching its enterprise software business. He developed all of the product and go-to-market strategies for the software-streaming technology while also leading the marketing initiatives for Ardence’s core embedded technology business, which represents the foundation of IntervalZero.
Prior to Ardence, Jeff was Vice President of Marketing at Adlex, Inc. He also headed product marketing for DataStage, a flagship product of Ascential Software Inc.
Jeff has held positions at Amulet, Inc.; Texas Instruments; InterSystems, Inc.; Unisys Corporation; and GTE Sprint.
He holds an M.B.A. from the University of Michigan and a B.S. in Industrial Engineering from Stanford.
Fabrice Boisset - GM, Europe, Middle East, Africa Region
With his deep understanding of RTX real-time software and nearly two decades of sales and technical experience in embedded and real-time systems, Fabrice is uniquely positioned to lead all IntervalZero sales, business/relationship development, and channel management efforts in the EMEA region.
Based in the company’s Nice, France, EMEA headquarters, Fabrice manages IntervalZero’s most extensive network of channel partners and business development resources, and travels extensively throughout the region to engage with Customers, Partners, and strategic prospects in target markets.
Additionally, Fabrice has responsibility for IntervalZero’s important Partner relationship with Microsoft in EMEA, and his efforts led to IntervalZero’s recognition by Microsoft as its top EMEA region Partner in both 2009 and 2010.
Fabrice has been with IntervalZero since its acquisition of the former VenturCom-Ardence embedded business from Citrix Systems, Inc. in 2008. His experience and expertise with RTX go back much further. He joined IntervalZero’s predecessor company, VenturCom, in 1999and remained with the company through the rebranding to Ardence and the acquisition by Citrix.
Earlier in his career, Fabrice held positions as Product Manager at Microprocess SA, and Software Engineer at J.I. Sarl and Thomson CSF RCM in France.
Fabrice holds a Master’s Degree in Electronic Engineering Technology from the University “Pierre et Marie Curie”, Paris, France.
Scott Bookman - Director, RTX64 RTOS Engineering
Over the course of his career, Scott has ridden the crest of the technology wave. He has been a passionate and trusted leader in the development of large enterprise technology products, ranging from Secure Remote Support applications, to Disaster Recovery, High Availability and Converged Infrastructure Solutions, to Cloud Computing Software products. Most notably, Scott led the effort to build and deploy an enterprise IT Quality Assurance Center of Excellence (CoE) that supported 25+ applications and engineering products worldwide.
A staunch supporter of the Agile philosophy and its practices, Scott brings over 15 years of trainings, certifications and experience for building and contributing to high performing software development and test teams from EMC Corporation, Dell Technologies and PTC Inc.
Scott joined IntervalZero in November 2021 and holds a Bachelor of Science degree in Management Information Systems from the University of Vermont and a Master of Science degree in Engineering Management from Tufts University.
Brian Calder - Vice President, Sales (NA & APAC)
A highly experienced sales and marketing executive with a solid technical background, Brian has had more than two decades of successfully delivering technology solutions to the Fortune 1000 market through both direct and indirect sales channels.
Brian joined IntervalZero from Akonix Systems Inc., where as Vice President of Strategic Accounts he helped establish the company as a key player in the Unified Policy Management space on Wall Street. Prior to Akonix, Brian had been Vice President of Strategic Accounts at Jabber Inc.
At both Akonix and Jabber Brian focused on managing top accounts in the financial community as well as building and maintaining relationships with strategic partners such as Microsoft, IBM, Cisco, Avaya, and EMC.
Brian began his career as a Systems Engineer and has successfully leveraged his technical skills throughout his sales and business development career.
A New Zealand native, Brian completed his Bachelor of Science in Wellington, NZ, and also received a graduate degree in Management Systems.
Terri Hawker - Vice President Product Management
Terri Hawker heads IntervalZero’s Product Management initiatives and chairs the company’s Development Committee (DevCom), which guides overall product development strategy and approves the roadmap for the company’s flagship hard real-time software products, RTX64 and RTX.
Terri establishes the product requirements for each release of RTX64 and RTX by carefully assessing market trends and forces, considering customers’ product enhancement requests and their product feedback, and by consulting regularly with the customers’ senior leadership as well as sales and R&D executives. She shepherds the feature set through the agile product development process all the way through product delivery from engineering to manufacturing.
Terri’s long experience with IntervalZero’s software, her deep knowledge of embedded software development and the Windows operating system, and her extensive engineering background makes her uniquely qualified to spearhead Product Management.
Terri began her career in 1997 as a Northeastern University Co-op at VenturCom, a predecessor company of IntervalZero and the company that originally developed RTX. Terri continued with the company in a variety of Engineering roles in its several reincarnations as VenturCom was rebranded as Ardence and as Ardence was acquired by Citrix in 2007.
Terri was part of IntervalZero’s founding team in 2008 when CEO Jeff Hibbard led the acquisition of the Ardence embedded business from Citrix. Terri served as an Engineering Manager at IntervalZero until she was named Product Manager and later Director of Product Management in 2011.
She holds a Computer Science Degree from Northeastern.
Jerry Leitz - Director Field Engineering, Motion Control
Jerry has over 25 years of experience developing high-performance motion control and vision systems, as well as developing real-time software to control automation equipment.
Prior to joining IntervalZero, Jerry was the Software Development Manager at Pitney Bowes, where he helped develop very large-scale mailing and sorting machines. He was brought there in 1999 to help develop a purely software-based motion control system. These systems used custom ethernet-based servo amplifiers and could have over eighty servo motors on one machine.
Mark Van Vranken - Chief Financial Officer
Mark has unparalleled expertise and experience in all financial and operational aspects of the embedded software business and was uniquely prepared to assume leadership of IntervalZero’s financial operations at the company’s inception in 2008.
Prior to joining IntervalZero, Mark had been a key member of the VenturCom/Ardence/Citrix finance team since 1999 and was deeply involved in everything from product pricing and product licensing, to the legal and financial intricacies related to dealing with a global customer base and worldwide channel Partners.
Prior to Citrix’s acquisition of Ardence in 2007, Mark had been the Controller at VenturCom/Ardence.
Previously, Mark worked at Lotus Development and at several successful high-tech startups.
He holds a Bachelor of Science degree from the University of Santa Clara.
