Key Personnel

Shahar Ladecky, B.Sc.
Head of Research & Development

Founder of ATSI, Graduated from the Aeronautical Engineering Department of the Technion IIT (Israel Institute of Technology) in 1977. Since then he was involved in numerous defense and civil aerospace projects in various countries. Supporting the FAA Flight Standards Department (currently AFS-440) since 1993. Mr. Ladecky specializes in the fields of computer modeling and simulation, especially flight simulation (fixed wing and rotary wing), use of wake vortex models, aerodynamics and flight mechanics.

Leon Stinson
ATSI Lead for ATM, NextGen & ATC Training

Mr. Stinson has extensive professional experience at the senior executive level in FAA air traffic control, air traffic controller training, air traffic facility management and air traffic operations. He has managed all facets of the daily operations of one of the largest and busiest Air Route Traffic Control Centers (ARTCC), in the national airspace system. 

As an ARTCC Operations Manager, he was responsible for control room operations with seven Areas of Specialization. These areas had the designated responsibility for all civilian airports and military facilities in a six state region. As an Evaluation Specialist in the Office of System Effectiveness & Evaluation, he evaluated the performance of the FAA’s ARTCC’s, Control Towers, Approach Controls, Flight Service Stations, and facilities in the Federal Contract Tower Program against local and national FAA directives. He also served on the National Free Flight Phrase 1 Program Development Committee. 

Mr. Stinson was on the team instrumental in opening Kabul Afghanistan’s Air Control Center (KACC). The KACC is the world’s first completely non-radar Air Traffic Control Center which was established for the United Nations, the U.S. Department of Defense, International Security Assistance Force (ISAF), NATO, and the Afghanistan government. 

While in Afghanistan, he served as the KACC Facility Evaluator and the Deputy Training and Standardization (ATSN) Officer, converting U.S. Air Force Air Traffic Training Directives to International Civil Aviation Organization (ICAO) standards. He also developed and briefed safety standards for UAV flights and methods of applying Kill Box procedures for the safe integration of UAV’s into Kabul airspace in support of warfighters. 

Mr. Stinson is an FAA Certified Radar Air Traffic Controller, Airspace and Procedures Specialist and has a control tower operator’s certificate (CTO), earned in the U.S. Air Force. He holds a Secret clearance and has served as an expert advisor to the International Civil Aviation Organization (ICAO). Mr. Stinson is also a member of the Air Traffic Controllers Association (ATCA), which supports global aviation.

Jonathan Liese, B.Sc.
Head of Software Development

Mr. Liese graduated from the University of Central Oklahoma with a B.S. in Computer Science and a B.S. in Mathematics. Specializing in software engineering with emphasis on automation procedures, he has been working with software development in the field of aerospace simulation and related areas since 2001. Mr. Liese has led various software projects that are used in the field by the FAA today.

Brian Abercrombie, B.Sc.
Lead Communications, IT and Visualization Products

Mr. Abercrombie graduated from the University of Central Oklahoma with a B.Sc. in Computer Science with a minor in Information Systems and has been with ATSI since 2003. He has lead projects that include realistic WGS-84 3D visualizations, TCP/IP network layer communications, Voice-over-IP emulated radio communications, database interfaces, and web applications.

Ashley Williams, B.Sc.
Lead Scientific/Graphical Software Developer

Mrs. Williams holds a B.Sc. in Computer Science and has worked as a software engineer since 2001. She has worked on a wide variety of projects for the aviation industry in the areas of flight standards, flight procedures, and Air Traffic Control research and training. Combining her mathematical, scientific and computer software development talents she successfully lead or played a critical role in the development of complex graphics of several of ATSI products, including RNAV-Pro, EOSE and the SMART ATC simulation system.

Nanette L. Haag, B.Sc.
Head of Financial Department

Mrs. Haag serves as ATSI’s financial manager. She earned a B.Sc. degree from the University of Oklahoma and has completed additional accounting classes at the University of Central Oklahoma. In addition to performing the duties of financial manager, she assists in the area of human resource management. Mrs. Haag is an associate member of the Oklahoma Society of CPAs.