Over the course of the last forty years, Dr. Halkias has worked as an educator, researcher, practitioner, and the Federal Government. John has always considered it a responsibility to facilitate education and to try to advance and elevate the practice of Traffic Analysis for improved transportation decision-making. Soon after he started with FHWA in 2000, John initiated FHWA’s Traffic Analysis Tools Toolbox as well as the internal FHWA Traffic Analysis Tools Team. John led and has been actively involved in the initiation of many major FHWA Operations programs areas, including the Integrated Corridor Management (ICM) and Active Transportation and Demand Management (ATDM) programs. John has been an integral member of numerous major research initiatives, including the Next Generation Simulation (NGSIM) program, which developed detailed vehicle trajectory datasets to allow better validation of traffic simulation algorithms, as well as the Connected Vehicle (CV) Pilots Program. In conjunction with managing the development of guidance documents for practitioners on how to collect, manage, evaluate and utilize the multi-dimensional data set “Reliability Space” as tool inputs, John also initiated projects to provide guidance to the practitioners on modern “Big Data” techniques for data quality checks, data visualizations, data analysis techniques and appropriate experimental design.