More about our leadership
Donna Jonas
CEO & Managing Partner
With more than 18 years of experience spanning military, federal, government, and non-profit leadership positions, Donna brings extensive expertise in complex operational oversight, financial administration, and personnel management. Prior to joining Amstability, Donna served as the Chief Operating Officer for the Museum of the Bible, a world-class cultural institution located in Washington, D.C. In this role, she ensured efficient, high-quality, and seamless delivery of services to meet the Museum’s daily operational demands.
A former active-duty U.S. Army Aviation Officer and combat veteran, Donna previously served as a Senior AH-64D Apache aviator, deploying three times with the 3-101st Aviation Regiment in support of combat operations in Iraq and Afghanistan and leading extensive teams supporting complex mission sets. As a civilian, she served as the U.S. Army Senate Liaison Deputy Chief in support of the Office of Chief Legislative Liaison, managing highly sensitive Congressional interface in support of the Department of Defense’s strategic priorities. Donna currently serves as a Lieutenant Colonel in the U.S. Army Reserve and was selected as a National Security Fellow for the Foundation for Defense of Democracies.
Donna holds a Bachelor of Science in French from the University of Missouri and a Master of Policy Management from Georgetown University’s McCourt School of Public Policy, and resides in Northern Virginia with her husband, Andy, and two sons, Grant and Tyler.
Monica Gray
Chief of Staff
With over a decade of experience as an operational manager and C-suite executive assistant, I have developed strong expertise in optimizing operational efficiency and driving strategic initiatives across diverse environments. My career began as a certified dental assistant, but it quickly evolved into impactful leadership and project management roles. Most recently, I served as the Manager of Vendor Relations at the Museum of the Bible, where I effectively managed third-party contractors providing security, facilities management, and food and beverage services. Prior to that, I was the Executive Assistant to both the Chief Operating Officer and Chief Marketing Officer, supporting high-level executives in streamlining operations and enhancing organizational effectiveness.
Beyond my professional career, I have contributed significantly to my church plant, working alongside my husband to oversee training and development for leadership, membership building, scheduling travel, and leading the marriage ministry. These experiences have deepened my commitment to fostering strong vendor and stakeholder relationships, promoting teamwork, and enhancing cross-functional collaboration. Known for my dependability and excellent time management, I navigate complex challenges with a detail-oriented approach and a focus on conflict management.
Outside of work, I am a proud mother of three who loves spending time with family and friends. I enjoy traveling, relaxing with puzzle and word games, and cheering on my favorite football team. I’m excited to connect with others who share a passion for operational excellence and strategic growth!
Michael-John R. Waite
Director of Strategy & Relationships
Michael-John R. Waite is a security and risk management executive with extensive experience in global security operations, crisis management, and intelligence analysis. He specializes in counterterrorism, active shooter mitigation, and enterprise security strategy, helping organizations strengthen security teams, mitigate risks, and enhance operational resilience.
Previously, as Director of Crisis & Risk at the Museum of the Bible, he developed a 24/7 Global Command Center, designed executive protection programs, and coordinated security for high-profile individuals, including U.S. government officials and foreign dignitaries.
A recognized industry speaker, he presents on emerging threats, cultural property protection, and crisis preparedness at national and international conferences. He holds a Bachelor’s degree in International Relations & Global Security and is pursuing a Master’s degree. His professional certifications include CIPM II and EPS.
Michael-John serves on the Advisory Board for the International Foundation for Cultural Property Protection (IFCPP) and is the Executive Director of Anchor & Vine Global Outreach, a non-profit focused on international missions and humanitarian aid. Based in Florida, he enjoys fishing, golf, and outdoor activities with his wife, Ashley, and their son, Lincoln.
Scott Thomson
Operations Manager
As Operations Manager at Amstability, Scott Thomson is responsible for the execution and oversight of day-to-day operations across all active contracts. With a sharp operational focus and a strong logistical background, Scott ensures that services are delivered efficiently, partners are aligned, and client expectations are consistently exceeded.
A U.S. Army veteran and former Airborne Combat Engineer (MOS 12B), Scott brings a disciplined and tactical approach to operations. His military training in obstacle clearance, reconnaissance, and engineer support laid the groundwork for his post-service expertise in fleet maintenance, transportation, and logistics management.
At Amstability, Scott leads the operational rollout of secured contracts—establishing workflows, assigning partner responsibilities, and coordinating recruitment and onboarding. He manages payroll documentation in collaboration with specialists and maintains communication with field teams, particularly janitorial staff, to ensure seamless execution.
While Scott contributes to strategic planning and business development in a supporting capacity, his primary role is centered on contract performance, supply chain oversight, and maintaining the operational integrity of all service lines. From inventory control to scheduling and partner support, he plays a critical role in keeping operations running smoothly and clients fully supported.
Ahmad Fayaz
Procurement Specialist
A results-driven professional with over 17 years of experience in customer service, office operations, leadership, debt and risk management, and procurement. I began my career as a Call Center Representative and advanced into management and specialist roles, earning a reputation for dependability, adaptability, and strong execution.
I have completed academic studies in Business Administration.
In current role as a Procurement Specialist, I manage strategic sourcing, vendor relations, contract negotiations, and bid coordination - driving cost efficiency, compliance, and operational performance.
Outside of work, I enjoy playing snooker, spending time with family, and committed to building a strong future in the United States for myself and loved ones.
Mary Ann Eurenius
Finance Specialist (AP/AR)
Mary Ann brings over 30 years of financial leadership experience across international compliance, legal, and hospitality sectors to her role as Finance Specialist at Amstability, where she ensures precision in accounts management and operational efficiency.
Her distinguished career includes strategic financial oversight for organizations generating $1 OM+ in revenue. At Freeh Group International Solutions, she navigated complex multi-state payroll and multi-currency systems for an international compliance and affiliated law practice. She served as Controller for 2 private country clubs -Cavaliers Country Club and Greenville Country Club, where she advised Board of Directors on budgetary strategy while overseeing full accounting operations. Mary Ann's tenure at Greenville Country culminated in her appointment as Interim General Manager-demonstrating exceptional operational leadership beyond core finance functions.
Mary Ann pursued accounting studies at the University of Delaware and completed coursework toward her Certified Property Manager designation at NYU. Committed to community service, she has served six years on the Finance Council at Immaculate Conception Parish, alongside of Parish Council and Golf Committee. Based in Pennsylvania she was recently elected Auditor of her township. She enjoys swimming, reading, the beach, Italian travels, and spending time with her husband and their inquisitive Golden Retriever.
Sierra Tarkington
CEO & Managing Partner
Sierra Tarkington brings a wealth of experience in strategic advisory, operational management, and cultural property protection. As a Special Advisor to the CEO and Managing Partner at Amstability, she ensures effective execution of strategic initiatives, operational efficiency, and alignment with organizational goals. Sierra leverages her background in executive leadership and communication to address complex challenges and maintain focus on critical priorities.
In addition to her advisory role, Sierra is the owner and operator of Threshold Climbing, Fitness & Yoga, Oklahoma’s largest climbing gym. Since 2016, she has successfully managed this 20,000-square-foot facility, leading a team of 30 employees and contractors to provide top-tier services for climbers, fitness enthusiasts, and youth programs.
Sierra holds a Master of Liberal Arts in Museum Studies from Harvard University, where her research focused on cultural property protection in conflict zones. She also earned a B.B.A. in International Business from the University of Central Oklahoma, where she received the Global Competency Award. Her professional expertise spans museum collections management, curatorial leadership, and innovative operational strategies.