EXPERIENCED MANAGEMENT TEAM

Sentinel’s management team offers more than 200 years of combined industry experience. This is a rarity in an industry that didn’t exist 40 years ago. Clients benefit from real world experience solving complex problems that face the criminal justice industry.

MARK CONTESTABILE

PRESIDENT

  • 20+ years of experience in the electronic monitoring industry across operations, sales, marketing and
    field services
  • Former Divisional President of Misdemeanant Services at Sentinel, overseeing delivery of community-based supervision programs for 100+ courts nationwide
  • Deep expertise in business development, customer relationships and program execution
  • Leads Sentinel’s sales, marketing and business development efforts

DENNIS FULLER

CHIEF FINANCIAL OFFICER

  • 8+ years of experience in the
    electronic monitoring industry with extensive finance leadership in tech-
    enabled businesses
  • Former CFO for multiple high-growth, technology-oriented companies across diverse sectors
  • Began career in public accounting at Ernst & Young
  • Leads Sentinel’s finance, accounting and administrative functions

DARRYL MARTIN

CHIEF OPERATING OFFICER

  • 20+ years of leadership in the electronic monitoring industry with expertise in operations, technology application and service innovation
  • Leads all internal and external operational functions across Sentinel
  • Former President of G4S Justice Services, acquired by Sentinel in 2012
  • Previous leadership roles at Digital Products Corporation
  • Graduate of the G4S Executive Development Program (Manchester School of Business)

YOGI RAJALA

CHIEF TECHNOLOGY OFFICER

  • 20+ years of experience in electronic monitoring technology and public safety systems
  • Co-Founder of Omnilink Systems; led development of industry-leading monitoring technologies
  • Launched multiple mission-critical public safety and enterprise
    technology solutions for state and
    local governments
  • Named inventor on 20+ patents across monitoring and technology domains
  • Leads Sentinel’s product, engineering and information systems teams

JULIE HUNT

VICE PRESIDENT HUMAN RESOURCES

Julie Hunt is one of the longest-tenured Sentinel Offender Services employees, with over 25 years of service at the company. With this background, she is the perfect person to be responsible for human resources. Julie is responsible for implementing HR strategies and practices that enable Sentinel to recruit, train, and retain the highest performing and most motivated workforce possible. Julie helps to propagate the Sentinel culture through talent management, staffing, employee benefits, learning, and development.

MELISSA STARR

SENIOR VICE PRESIDENT FIELD OPERATIONS

Melissa Starr began her career in the electronic monitoring industry in 1997 with Sentinel Offender Services managing an active offender caseload of 150 clients in Los Angeles County. She was quickly promoted through the company to branch manager, project director and then field operations manager. In 2018, Ms. Starr was promoted to Senior Vice President of Field Operations. She is responsible for contract retention, ensuring adherence to strict standard operating procedures (SOP’s) and expanding the spectrum of services with customers. Her expertise in relationship building with customers and consulting towards “best practices” has resulted in a contract retention rate of over 95 percent in a very volatile and competitive industry.

JEFF MCDANIEL

SENIOR VICE PRESIDENT CHANNEL PARTNERS

Jeff McDaniel brings a wealth of experience and leadership to his role as Senior Vice President of Channel Partners at Sentinel Offender Services.  Jeff joined Sentinel in 2016 with over 14 years of experience in the telecommunications industry where Jeff honed his expertise in vendor management, customer service, and operational strategy. Today, he oversees Sentinel’s Reseller Channel, ensuring seamless collaboration with partners and delivering innovative solutions to meet client needs.  Jeff’s commitment to excellence and his ability to cultivate strong partnerships make him a key leader in advancing Sentinel’s mission and expanding its market presence.