Guillaume Castel

Chief Executive Officer

Since assuming the role of CEO in July 2019, Guillaume Castel has propelled PerfectServe to significant growth and solidified its position as a leader in the healthcare scheduling and communication space with the highly acclaimed PerfectServe Unite platform. Customers and analysts alike have validated the platform’s excellence under his leadership. Drawing from nearly two decades of experience in strategy, business development, finance, and operations within the technology and healthcare sectors, Castel has steered the company through successful acquisitions, including Telmediq and Lightning Bolt. With these transformative developments, PerfectServe finds itself at a pivotal juncture, and Castel continues to drive the development and expansion of the entire PerfectServe portfolio.

Castel previously served as Vice President of Business Development at Inova Health System, a large nonprofit provider in Northern Virginia with five main hospitals, over 18,000 employees and more than $3 billion in yearly revenue. Inova is one of the nation’s most innovative health systems, having received the Washington, D.C. region’s only five-star rating from the Centers for Medicare and Medicaid Services. In his role, Castel drove the agenda for growth at the highest levels of the organization, including architecting, owning and negotiating two of the largest inorganic expansions in Inova’s recent history.

Before Inova, Castel was with the Advisory Board Company, a publicly-traded best practices firm specializing in healthcare with over 3,000 employees and yearly revenue of more than $800 million. He was part of the team that arranged the sale of the Advisory Board’s Performance Technology portfolio to Optum, and subsequently co-led the first two quarters of integration work. In his appointment as COO of Performance Technology, Castel had responsibility for operations and strategy for the technology business, where he also oversaw analytics and workflow product launches. Castel ran the Advisory Board’s partnership program, driving innovation through relationships with large tech firms, consulting companies and smaller niche players.

Prior to Advisory Board, Castel spent six years at Cisco Systems, ultimately serving as Director of Business Development. His various managerial and executive roles at Cisco required managing technology at scale, driving innovation, acquiring new software capabilities, designing a partner-led commercial engine and leading multibillion-dollar joint venture deals. Before that, Castel also spent seven years with IBM in a number of roles ranging from Finance and Operations in IBM Global Services to Corporate Development at IBM’s headquarters.

Castel serves on the boards of the Heifer Foundation,, and Grapevine Health.

Originally from France, Castel received an MBA in Finance from the Institut d’Administration des Entreprises.