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, Contracts, and Finance at the Yulista Holding level.
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Ben Still
VP of Corporate Development
As a seasoned business development professional with a robust strategic planning, capture management, proposal development, and pricing strategy background. In his most recent position, Ben played a key role in business development and capture for an $800M business line, focusing on facilities sustainment, logistics, aviation support, and protective services. His diverse experience includes previous roles as Project Manager, Capture Manager, and Program Director.
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Steve Dinome
VP of Maintenance Logistics, YHL
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, Steve leads the Maintenance Logistics Group (MLG) as the VP of Maintenance Logistics managing its operating companies (YSS/YuCon/Y-Tech).
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Andrew Gignilliat
VP of Manufacturing, Integration, Modification, YHL
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. Andy leads the Modification, Integration, Manufacturing (MIM) Group at the Yulista Holding level managing Yulista's (MIM) operating companies (YIS, YAI, YAD).
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Mark Terseck
VP of Technical Services, YHL
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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Richard Harville
VP of Base Operations Support, YHL
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 and quickly advanced. Today, Richard Harville is the Vice President of Base Operations Support (BOS) Group at Yulista. In addition to this pivotal role of Group VP, Richard will continue to serve as the President of Yulista subsidiaries, Tunista Logistics Solutions and Demil Transport Services.
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Tim Strait
VP of Emerging Technology & Transformation, YHL
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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YHL leadership Directors
Krystal Valich
Director of Pricing
With over 15 years of experience in pricing analysis, strategy development, and implementation, Krystal (KV) has successfully led cross-functional teams to drive pricing initiatives aligned with organizational goals and market dynamics. Her expertise extends beyond traditional pricing models, encompassing innovative approaches to pricing optimization, dynamic pricing strategies, and competitive analysis.
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Ashley Ranguelov
Senior 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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Chris Simpson
Senior Director of Finance
Chris's expertise spans various facets of finance, with focus on budgeting, forecasting, and strategic analysis. His unwavering commitment to achieving financial targets and driving excellence is evident throughout his career. With over 15 years of invaluable experience in finance, Chris brings a wealth of knowledge and leadership to this position. He has demonstrated exceptional strategic insight in his previous roles, including overseeing financial strategy for multiple subsidiaries within the Tech Services Group since May 2023.
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Eric Cornelius
Director of Facility & Hangar Operations
Eric began his journey with Yulista in 2008, embarking on a career that has seen him traverse various project teams before finding his niche in the facilities department in 2016. Over the years, Eric has accumulated a wealth of experience, contributing to the successful consolidation to the Redstone Gateway Complex and overseeing the design and construction completion of multiple hangars. In his current role, Eric and his team play a pivotal role in coordinating with YHL and its subsidiaries, adapting to ever-evolving facility and hangar requirements to align with mission objectives stemming from contract awards.
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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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Julia Watkins
Director of Human Resources
With over two decades of experience in HR management, Julia brings a wealth of expertise and leadership to our company.
Her extensive background in policy development, benefits design, process improvement, and employee relations for Federal Contractors will be invaluable as we continue to grow and evolve. Julia holds a Bachelor of Science in Management of Human Resources from Faulkner University. Her dedication to fostering a positive work environment and supporting our employees aligns perfectly with our company values.
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Ronald Husa
Senior 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, Ron oversees all quality assurance and quality management functions for Yulista and its subsidiaries.
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Monika Crannell
Director of Proposals
Mo's strong background in business development processes and deep understanding of industry best practices make her a valuable asset to our team. She excels in cross-functional communication and has a proven track record of seamlessly interfacing with senior executives, functional organizations, and customers alike.
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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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Subsidiary presidents
Lynn Troy
President, Troy 7, 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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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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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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Tim Strait
President, 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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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, Tunista Logistics Solutions (TLS) and Demil Transport Services.
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Jong Lee
President, Yulista Tactical Services, LLC / Yulista Solutions, LLC / Yulista Services, 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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David hollenbach
President, DSoft Technology
Mr. Hollenbach is President of DSoft Technology. David graduated from the US Air Force Academy in 1987 with a Bachelor of Science degree in Engineering Mechanics and later received his Master of Science degree in Systems Engineering from the Air Force Institute of Technology. He has worked on a variety of systems engineering and IT projects throughout his career. His domain experience ranges from work on military, civil, and commercial space-related projects as an engineer/analyst and military operations planner and operator, to ecommerce projects as a systems engineer and project manager. He is a service-disabled veteran.
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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.
