Humble servant leadership is powerful. It elevates people and has a lasting impact on those it serves. Our leadership team sets a clear direction for our vision. They lead by example. We are appreciative of their unwavering commitment to our mission and our teams.

Executive leadership

Josh Herren

CEO/ President
After serving in the US Air Force, Josh joined the Calista HQ team leading strategic planning, M&A activities, and corporate development. In 2011, Josh joined the Yulista team with goals to bring in a leadership team, re-structure the business, and most importantly, grow the business and cast a vision for the future.
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Kristina Hambrick

VP of Business Operations
Kristina has a wide range of experience leading teams in support of U.S. Army and Foreign Military Sales with expertise in missile, aviation, and ground support equipment. She specializes in executing design and development programs, providing cradle-to-grave solutions for the warfighter. As the Vice President of Business Operations, Kristina is responsible for overseeing Human Resources, Finance and Pricing, Contracts, Information Technology and Security at the Yulista Holding level.
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Mark Terseck

VP of Technical & Base Operations Services
Mark has more than 30 years of service to America's DoD and Civil space programs in both government and industry roles. Mark has led organizations supporting MDA, NASA, and the US Army, supporting programs including the US Missile Defense System (MDS), the Space Shuttle Program, and the US Air Force Eastern Test Range. Mark's executive experience is in operations and business growth strategy development and execution.
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Ian Neumann

VP of Business Development
As VP of BD, Ian and his Team work closely with Subsidiary Leadership supporting strategic planning, new business development and proposal activities. Prior to taking on the role of VP of BD in FY21, Ian served Yulista as a Subsidiary Lead for Yulista Tactical Services, LLC and Yulista Solutions, LLC.
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YHL leadership Directors

Wayne Blockel

Senior Director of Technology & Enterprise Security
Wayne has spent 35 years in various technology leadership roles. As Yulista's Director of Technology, Wayne brings extensive experience in the fields of cyber security, IT infrastructure, Enterprise Resource Planning systems, process improvement, and data center operations.
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Richard Montecalvo

Director of Facility and Hangar Operations
As Director of Facility and Hangar Operations, Rich oversees facility operations, implementing industry best practices into daily operations. After retiring from the US Air Force, Rich joined Yulista in 2010 with over 30 years of aviation and program management experience.
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Ronald Husa

Director of Quality
Ron previously served as the Quality Manager for Y-Tech Services and Yulista Support Services from 2014-2018. As the Director of Quality, Mr. Husa oversees all quality assurance and quality management functions for Yulista and its subsidiaries.
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Ashley Ranguelov

Director of Marketing Communications
Ashley is responsible for fueling marketing, communications, and organizational culture strategy at Yulista. Ashley’s team provides core marketing support, including branding, corporate communications, digital marketing, events, and strategic marketing. Ashley joined Yulista in 2020 with over 15 years of marketing experience in global high-tech industries.
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Dwain Pannell

Director of Finance
Dwain works with each Yulista subsidiary to develop and execute financial and pricing strategies. Dwain oversees each subsidiary with regards to financial compliance and controls ensuring that best practices are standardized throughout the organization.
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Angela Warner

Sr. Director of Human Resources
Angela Warner serves as the Senior HR Director for Yulista Holding. She oversees a staff of HR professionals who serve and support Yulista’s most valuable assets – its workforce. She has 25+ years progressive experience in human resource leadership with a majority of that time specializing in government contracting. Angela joined the Yulista team in 2005.
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Jacqueline Lutz

Director of People & Culture
As the Director of People & Culture, Jacqueline’s mission is the continued growth and engagement of our people, or simply, to put our people first. As a SHRM Certified Professional, she knows that the workforce is ever evolving, so the importance of continuous improvement and employee engagement is a must if we are to ensure our people are equipped for continued growth, success, and happiness in the workplace.
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Courtney Andrews

Director of Contracts & Compliance
As Director of Contracts & Compliance, Courtney oversees contract administration and SBA 8(a) compliance for each of the Yulista subsidiaries. Courtney has ten years’ experience in contract management and has been supporting Yulista’s subsidiaries since 2017. She also serves as Yulista’s Empowered Official responsible for ITAR/export compliance. Courtney is also a Certified Federal Contract Manager (CFCM) and is currently pursuing her PhD in Law & Policy from Liberty University.
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Subsidiary Leadership

Steve Dinome

President, Yulista Support Services, LLC / Y-Tech Services, Inc. / Yulista Contract Services LLC
After graduating from Fairleigh Dickinson University in Teaneck New Jersey, Steve worked for some of the largest Government subcontractors, progressing from Systems Engineer to Program Management Director then to Business Operations Director encompassing over 30 years of experience. Steve joined Yulista in 2014 as the General Manager for Y-Tech and YSS. In 2019, he achieved the position of President of Y-Tech and YSS overseeing large scale DoD and DHS contracts with a portfolio of over $100M in revenue. Today Y-Tech/YSS has grown to over 300 employees and is operating in the maintenance, modification, logistics and calibration areas of the Government in over 20 states in the U.S.
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Andrew Gignilliat

President, Yulista Aviation, Inc. / Yulista Integrated Solutions, LLC / Yulista Aerospace and Defense, LLC
Andy is a retired US Army Officer with nearly 27 years of Army Aviation leadership, maintenance, and program management experience across conventional and special operations aviation. Upon retirement, Andy joined industry to lead aviation program management, business development, and multidisciplinary teams across the commercial sector.
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Lynn Troy

President of Troy7 Inc.
Ms. Lynn Troy is the co-founder of Troy 7, Inc. Troy7 is an Aerospace Engineering Company focused on telemetry, missile design and analysis, guidance and control, intel, and directed energy. Ms. Troy’s responsibilities have ranged from securing new engineering contracts and setting up all the internal business systems and procedures required for government contracting to employee benefit plan structuring, payroll, and facilities management.
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Tim Strait

President of StraitSys
Tim Strait co-founded StraitSys in 2007 and serves as its President.Tim Strait a highly respected technology and cybersecurity solutions provider specializing in Big Data Analytics, Information Technology Services, Counter-Insider Threat, Cybersecurity and Program Management across the intelligence community, federal law enforcement and Department of Defense. He is a mission-driven leader with over 30 years of experience as a business and technology executive focused on the design, development, launch and support of technology solutions, products and services in federal and commercial markets. He offers an acute comprehension of mission, customers and the critical intersection of technology, information and business operations.
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Jong Lee

President, Yulista Tactical Services, LLC / Yulista Solutions, LLC
A retired Army Colonel and Senior Army Aviator, Jong Lee brings 30 years of military and Aerospace Industry experience. Prior to joining Yulista, Jong managed tactical missiles and missile defense systems research and development programs, and prior to that, successfully held program and engineering management positions in Industry and Government.
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Richard Carr

President, Tunista Services, LLC / Chiulista Services Inc. / Tunista Operations Support Services
Richard has over 37 years of combined active duty/contractor experience in the Base Operations and maintenance field. In 1994, after serving 10 years active duty in the US Air Force, Richard began working as a Logistics Manager, Quality Manager and Program Manager for multiple companies. In 2006 Richard joined Yulista and has worked in various capacities for multiple subsidiaries. Today, Richard is the President of Tunista Services, Tunista Operations Support Services and the general manager of Tunista Logistics and Demil Transport Services.
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Richard Harville

President, Tunista Logistics Solutions, LLC / Demil Transport Services, LLC
Richard graduated from the University of West Florida in Pensacola, FL with a MBA and BS in Accounting Specializing in Controllership with a minor in Finance. Richard has been in the defense industry for nearly 17 years. He served as a civilian for the Missile Defense Agency and has worked for a number of large companies such as Jacobs, General Dynamics, DRS, and SAIC. Richard joined Yulista Holding as a Senior Financial Analyst in 2013. By 2014, he had quickly advanced to Director of Finance. In 2018, Richard was promoted to Director of Business Operations for Yulista Holding LLC. Today, Richard is the President of two of Yulista’s wholly-owned subsidiaries, Tunisia Logistics Solutions (TLS) and Demil Transport Services.
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Yulista’s leadership understands the importance and value of community and industry involvement. We’re honored to give our time and energy to these amazing groups and local organizations.