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Leadership and Management Team | Meet the Team

MDSL leadership brings years of experience and unparalleled technology expertise.

MDSL Executive Team | Technology Expense Management Experts

Scott Gilbert
Chief Executive Officer and Board Member

As CEO and member of the board, Scott is responsible for leading the Calero-MDSL organization into its next era of growth and innovation. A seasoned executive with over twenty years of experience in executive positions at telecom organizations, Scott brings a passion for how operations, sales, and technology can work together to deliver a truly exceptional customer experience. Scott most recently served as Chief Operating Officer of Calero Software prior to the merger with MDSL. Prior to joining Calero-MDSL, Scott led the technology and operations organizations as Executive Vice President and Chief Information Officer at FirstLight Fiber, a portfolio investment of Riverside Partners and Oak Hill Capital.







Andrew Taylor
President and Chief Revenue Officer

As President and CRO, Andrew is responsible for delivering an operative end-to-end customer and buying experience as well as providing strategic leadership within the company’s executive and senior teams. With nearly two decades of customer-facing experience in the telecom and managed mobility markets, Andrew aligns the marketing, sales and customer success teams around a go-to-market strategy that streamlines the customer journey. Prior to Calero-MDSL, Andrew was the VP, Sales at DMI where he helped them to achieve Leader status in the Gartner Magic Quadrant.




Simon Mendoza
Chief Technology Officer

Simon joined MDSL in 2003 as part of the Development Team after graduating from the University of Cambridge with an MA in Computer Science. He drove the development of a number of key technologies, including MDSL’s e-billing handler architecture, which led to the rapid growth of MDSL’s TEM offering. 

He was instrumental in the design and implementation of the hosting architecture which plays a central part in the delivery of MDSL’s self-service product, and now has overall responsibility for aligning the company’s IT policy with its overall business direction.





David Bliss
EVP, Product Management

David is responsible for Calero-MDSL's strategic product vision, development roadmap and go-to-market activities. David brings a wealth of experience in leading product management teams and taking a customer focused approach to strategic planning.

Prior to Calero, David led product management for CCC Information Services’ core technology platform where he launched their mobility and artificial intelligence product lines and achieved market-leading status in these areas within 18 months. He also served in a management consultant capacity with PwC and in progressive roles within product management and product marketing while at Accuity.

David holds a Master of Business Administration degree from Northwestern University’s Kellogg School of Management and a Bachelor’s degree in Global Studies with a minor in Mathematics from the University of Illinois at Urbana-Champaign.

Patrick Mulvehill
EVP, Operations

Patrick oversees Calero-MDSL’s ongoing customer operations, which includes ensuring best-in-class service to its growing customer base. With over 20 years of operations and technology leadership, Patrick most recently served as Chief Technology Officer at Excellus Blue Cross Blue Shield where he was responsible for strategic oversight and execution of the enterprise’s technology and investment strategies.




Calero-MDSL Board Members

Steve Kaplan

Steve is the chairman of the Calero-MDSL board and has more than 30 years of private equity, strategy consulting, and operating experience. He joined Riverside Partners as a General Partner in 2005.

Previously, Steve was a Managing Director of Audax Group, a private equity and mezzanine debt firm, and served as an Operating Partner at Texas Pacific Group. His operating experience includes serving as President of Harris Graphics, a $450 million printing press manufacturer, Executive Vice President and CFO of The Coleman Company, a $1.2 billion manufacturer of outdoor recreation equipment, and Executive Vice President, CFO, and CSO of AM International, a $1.2 billion graphic arts equipment and supplies manufacturer. Steve began his career in strategy consulting and was a Partner at The Boston Consulting Group.


Adam Hahn
Board Member

Adam W. Hahn is a member of the board. He is a Principal of Oak Hill Capital and has been part of the firm since 2010. Mr. Hahn works in the firm’s Media & Communications and Services groups. Prior to joining Oak Hill, he was a member of the mergers and acquisitions group at Barclays Capital PLC. Mr. Hahn earned an A.B. degree, cum laude, from Harvard University.








Benjamin Diesbach
Board Member

Benjamin Diesbach is a member of the board. He is a Partner of Oak Hill Capital and has been part of the firm since 1987. Mr. Diesbach is responsible for originating, structuring, and managing investments for the firm’s Media & Communications group. Prior to joining Oak Hill, he was an Executive Vice President at The Taft Broadcasting Company. Mr. Diesbach earned a B.A. degree from DePauw University and an M.B.A. degree from the University of Cincinnati.






Chris Ryan
Board Member

Chris is a member of the board. He brings 12 years of private equity and strategy consulting experience to the Riverside team, which he joined in 2011 as a Vice President.

Prior to joining Riverside, Chris was an Associate at Advent International, where he focused on investments in the industrial, industrial technology, and life science technology sectors. Prior to Advent, Chris worked at The Parthenon Group, a boutique strategy consulting firm.




Sanjeet Mitra
Board Member

Sanjeet is a member of the Calero-MDSL board and a Managing Director at SEP. He focuses on the firm’s hardware and software company investments and sits on the Investment Committee. Prior to co-founding SEP, he was a Principal at Silver Lake Sumeru, the mid-market investment strategy of Silver Lake and predecessor fund to SEP. Sanjeet has more than 10 years of investing and investment banking experience. He lends his strategic expertise to MDSL as a member of the Board of Directors. 

Prior to joining Silver Lake Sumeru, Sanjeet worked in the Investment Banking Division at Goldman, Sachs & Co. in San Francisco, working with clients in industrial, technology, media, telecommunications, and healthcare sectors.




Joe Pajer
Board Member

Joe has 35 years of technology industry experience, including more than 20 years in senior executive positions. Prior to the merger with MDSL, Joe served as President and CEO of Calero Software.

Previously, he was President & CEO of Thinklogical, the leading provider of high performance, multiple classification video and data distribution solutions for defense organizations worldwide. Before Thinklogical, he was the President & CEO of Vocollect, a premier provider of voice recognition-enabled computing solutions for mobile workforces.  Additionally, Joe has held several executive leadership positions with Marconi, FORE Systems, Compaq Computer and AT&T.

Joe holds a Master of Science degree in Management and a Bachelor of Science degree in Civil Engineering, both from Carnegie Mellon University in Pittsburgh, PA.