Leadership Team

As OneSource Virtual’s Chief Technology Officer, Joe Disharoon combines a strong leadership background with a passion for implementing innovative solutions, all with the goal of deploying technology that empowers OSV’s employees and its customers.

In his nearly 30 years of experience, Joe has a proven track record of guiding large business units to double-digit growth and has deployed advanced technology solutions as a business partner with more than 50 Fortune 500 companies.

Prior to joining One Source Virtual, Joe was the Chief Technology Officer for Kobie Marketing and the Senior Vice President of Technology for Epsilon. He has also held technology roles with Halliburton and Secor.

When he’s not working, Joe enjoys woodworking, swimming, and fishing. He lives in the Tampa Bay area with his wife and two children.

Jane Huston brings more than two decades of experience to her role as SVP of Human Resources for OneSource Virtual. 

As a key member of OSV’s leadership team, she’s committed to continuously strengthening the company’s employee programs and workplace culture to effectively attract, retain and reward top talent while maintaining OSV’s reputation as a great place to work. 

Prior to joining OSV, Jane spent more than a decade with Epsilon Data Management, serving in a variety of roles that included SVP of Human Resources and chief people officer. She has also worked for Grant Thornton LLP and Ernst & Young Consulting. In 2016, the Dallas Business Journal named Jane a “Women in Business Honoree” for her years of excellence in leadership. 

Outside of work, Jane stays very involved with Girls Inc., an organization dedicated to providing underserved girls ages 6-18 with the life-changing skills they need for success in school and in their careers. She is a reluctant jogger, but she thoroughly enjoys old movies and reading. Jane lives with her family in Dallas.

Brian Levey brings over 12 years of proven sales leadership to his role as OneSource Virtual's Chief Sales Officer. Leading OSV's North American sales organization, Brian drives revenue growth through a customer-centric approach focused on optimizing Workday investments for customers and prospects.

Since joining OSV in 2013, Brian has demonstrated exceptional leadership, rising from Inside Sales Account Manager to Chief Sales Officer in 2025. Under his leadership, the sales organization has consistently delivered strong performance while maintaining OSV's commitment to exceptional customer service and support.

A graduate of the University of New Hampshire, Brian achieved Regional All-American honors as a soccer player before competing professionally from 2008 to 2012. He lives in North Richland Hills, Texas, where he enjoys golf, cars, and playing guitar.

Carl Madaffari brings over 30 years of technology and product management expertise to his role as OneSource Virtual's Chief Product & Marketing Officer. Leading both product management and marketing teams, Carl drives OSV's product innovation and market positioning to deliver exceptional value for customers.

Since joining OSV in 2022, Carl has been instrumental in synthesizing complex market needs into focused product strategies while building high-performing product and marketing teams. His leadership ensures OSV maintains its market leadership through strategic innovation and expansion of the company's intellectual property portfolio.

Before OSV, Carl spent two decades at Epsilon/Publicis, where he held senior leadership roles in data management, product management, and marketing. He began his career at IBM, establishing a strong foundation in enterprise technology solutions.

Carl studied computer science at the University of North Texas. Outside of work, he enjoys travel, photography, music, and maintaining an active lifestyle with his family.

As OneSource Virtual’s Chief Legal Officer, Milla Rahmani leads the company’s legal organization and oversees all legal affairs, including privacy, compliance, corporate governance, and risk management. She brings extensive experience advising and scaling highly regulated, private equity-backed SaaS businesses, with deep expertise in mergers and acquisitions, commercial contracting, and strategic business transactions.

Prior to joining OSV, Milla served as Chief Legal Officer at Zenoti. She previously held the role of Chief Legal Officer at Edifecs, where she played a critical role in supporting the company’s growth and strategic initiatives, helping drive revenue expansion that ultimately led to Edifecs’ acquisition by Cotiviti in April 2025.

Milla has also served as General Counsel for several leading technology companies, including Litera, Numerator, and Lanyon. Throughout her career, she has provided legal leadership during periods of significant growth, transformation, and acquisition activity, including Lanyon’s acquisition by Cvent.

Milla earned her Juris Doctor from Southern Methodist University Dedman School of Law and a Master of Laws (LL.M.) from Queen Mary University of London. She is licensed to practice law in Texas, Illinois, and New York.

Recognized for her strategic, business-oriented approach, Milla partners closely with executive teams and boards to navigate complex legal and regulatory environments while enabling innovation, growth, and operational excellence.

Scott Reilly brings more than 21 years of global finance experience to his role as OneSource Virtual's CFO, with a proven track record of driving growth and operational excellence. His expertise spans financial planning and analysis, long-term planning, and mergers and acquisitions. 

Before joining OSV, Scott was CFO at Nitel Inc., where he led the company through a strategic sale to Comcast. He also served as CFO at New Era Technology and held senior finance roles at ADP, Hertz Corporation, Avaya Inc., and Golub Capital. 

Scott earned his MBA from New York University's Leonard N. Stern School of Business, where he specialized in finance and economics. He also holds a Bachelor of Engineering from the University of Aberdeen.

As OneSource Virtual's Chief Operating Officer, Michael Roseman is an experienced transformational leader driving operational excellence and empowering organizations with innovative solutions. Leading the company's service delivery operations, Michael is relentlessly focused on enhancing the customer experience and creating value across OSV's Business Process as a Service offerings. ​

Michael has proven experience leading teams in nearly every branch of OSV, making him uniquely qualified to act as this single point of accountability for the services OSV offers its customers. His approach combines a commitment to cultivating culture for success and developing creative solutions that deliver exceptional results. ​

Before assuming his current role in 2018, Michael served OSV as senior vice president of customer operations and senior vice president of finance and accounting outsourcing. He began at OSV as vice president of professional services, where he focused on delivering reliable and efficient services that maximized customers’ Workday investments. ​

In addition to his many years with OSV, he has held executive leadership positions at Astadia, Inc. and Marketing Advocate, LLC. ​

Michael holds a BA in history from Emory University, an MBA from the University of Texas at Austin, and a graduate certificate in Mandarin from the Chinese University of Hong Kong.

Ellen Terchila brings extensive customer success experience to her role as OneSource Virtual's Chief Customer Officer, with a proven track record of building and scaling customer organizations at leading B2B SaaS companies. Her expertise spans customer success strategy, retention and expansion programs, and post-sales team leadership.

Before joining OSV, Ellen was CCO at Hootsuite, where she led all post-sales customer teams. She also served as CCO at Electric and Senior Vice President of Customer Success at Marigold. Her journey in customer success began at Workday in 2011 as a founding member of their Customer Success function.

Ellen holds a BS in public relations from Syracuse University’s S.I. Newhouse School of Public Communications. She calls Nashville home, where she lives with her husband, stepdaughter, and their two dogs.