About us
Leading Airport Consulting Firm
RoVolus LLC is a premier airport consulting firm focusing on optimizing airport operations and enhancing overall efficiency.
Our dedicated team of experts provides tailored solutions for airports of all sizes.
We pride ourselves on our proven track record and commitment to exceeding client expectations.
Rocio Zarubiak, Owner
Ms. Zarubiak is an accomplished manager of airport finance and environmental projects. Prior to running RoVolus, she previously worked in the Finance Department at Dallas/Fort Worth International Airport and at the United States Environmental Protection Agency (EPA). She has experience working with airport management to secure financial justification for projects that result in environmental improvements. Ms. Zarubiak is well connected to key decision makers in the airport industry and has demonstrated her ability to serve as a trusted advisor. She is a capable user of environmental models such as Sandia National Laboratory’s Solar glare Hazard Analysis Tool (SGHAT) and the Federal Aviation Administration’s (FAA) Aviation Environmental Design Tool (AEDT). Ms. Zarubiak may be reached via email at rocio@rovolus.com and via telephone at 214.298.2402.
Practice Area:
Management and Quality Assurance/ Quality Control
Darcy Zarubiak—Managing Director
Mr. Zarubiak has more than 30 years of experience in airport planning, air quality assessment, airport environmental management, and the operational components of environmental sustainability at an airport. Mr. Zarubiak consistently applies scientific and financial considerations to environmental challenges to create solutions that benefit an airport’s bottom line. He has a unique ability to manage operational, environmental and financial aspects of projects in a way that maximizes the contributions from each stakeholder, and results in outcomes that reflect the expertise of the entire team. Mr. Zarubiak’s has positioned RoVolus as a firm that is deeply committed to strong client relationships and encourages strategies that create true partnerships. Mr. Zarubiak is managing the Policy Engineering Analysis and Research Support (PEARS) II contract for the Federal Aviation Administration (FAA) supporting FAA’s Office of Airports, Office of Environment and Energy, and Air Traffic Organization. Mr. Zarubiak also led the Air Quality Source Apportionment Study - Demonstration Project at Los Angeles International Airport. In addition, he has helped prepare more than 60% of the successful Voluntary Airport Low Emissions (VALE) Program applications submitted to FAA since 2008. Mr. Zarubiak has a Bachelor of Engineering (Mechanical Engineering) degree from the University of Saskatchewan and a M.S.E. degree (Mechanical and Aerospace Engineering) from Princeton University. Mr. Zarubiak may be reached via email at darcy@rovolus.com and via telephone at 214.551.7651.
Practice Area:
Management and Quality Assurance/ Quality Control
Don Maddison—Director
Dr. Maddison’s career has been devoted to the technical, operational, and environmental aspects of air transportation planning. He has managed large-scale airport planning and environmental projects that have included extensive coordination with local planning agencies as well as citizen and industry groups at airports in the United States and abroad. Dr. Maddison’s entry into aviation consulting in the United States coincided with the signing of the National Environmental Policy Act (NEPA) in 1970, and he has had a key role in some of the most challenging NEPA-related environmental reviews for airport expansion projects. From 1972 through 1976, Dr. Maddison managed technical analyses for the Federal Aviation Administration’s (FAA) Airport Capacity and Delay Project--the results of this project formed the basis for AC150-5060-5 Airport Capacity and Delay. Dr. Maddison is a meticulous Technical Writer with vast experience in the aviation environmental domain and has created hundreds of technical documents to support environmental analyses of all kinds. Dr. Maddison provides technical, contract administration, and overall QA/QC services for RoVolus' consulting engagements. Dr. Maddison received his Bachelor of Science degree in Civil Engineering (Traffic Engineering) from Durham University (UK), and his Master of Science degree and Doctorate in Civil of Engineering (Transportation) from the University of California, Berkeley.
Practice Area:
Software,
Air Quality, and Aircraft Noise
Stephen Augustine—Director
Mr. Augustine has 30 years of experience in the aviation environmental domain as a software engineer, analyst, and consultant. As a senior software engineer, he has supported the Federal Aviation Administration’s (FAA) Office of Energy and Environment and the Office of Airports as a lead developer on most of FAA’s key aviation environmental modeling tools. He was the original designer and developer of the Emissions and Dispersion Modeling System (EDMS) and provided core support for the development of the Noise Integrated Routing System (NIRS) and the Airspace Environmental Screening Tool (AEST). He is currently a senior contributor to the ongoing development of FAA’s Aviation Environmental Design Tool (AEDT). Over the years he has also been the Principal Investigator for several National Aeronautics and Space Administration (NASA) and Airport Cooperative Research Program (ACRP) research efforts as well as supporting the implementation of numerous environmental assessments (EA), environmental impact statements (EIS). In recent efforts he has managed RoVolus projects on airport decarbonization studies and multiple FAA airport grant funding applications. Mr. Augustine received a Bachelor of Arts degree in Physics and Computer Science from St. John’s University, Minnesota.
Practice Area:
Air Quality, Aircraft Noise, and NEPA
Donovan Raibon-Johnson—Associate Director
Mr. Raibon-Johnson has more than 15 years of aviation technical experience, specializing in National Environmental Policy Act (NEPA) compliance, aviation noise and environmental analysis, airspace management, network and fleet analysis, aircraft systems, flight performance modeling, and airside fuel planning. He has led diverse aviation-related projects such as developing new methods of adding military and general aviation noise profiles to industry standard modeling tools, serving as the quality control lead for the primary Federal Aviation Administration’s (FAA) fast-time simulation tool covering the entire national airspace system, the development of a nationwide fuel properties database to assist with tracking fuel quality for airport fuel farms, and the performance of NEPA air quality and noise analysis and document development for several large-scale airport projects. Mr. Raibon-Johnson has multiple areas of technical expertise and is also proficient in the utilization of the various modeling and simulation tools used by aviation divisions within multiple Federal agencies and the private sector. Mr. Raibon-Johnson is a licensed commercial pilot, with his experience in airline and flight operations giving him valuable, uncommon insight into airline and flight operations. Mr. Raibon-Johnson received a Bachelor of Science degree in Flight Education from Hampton University and a Master of Science degree in Community and Regional Planning from the University of Texas, Austin.
Practice Area:
Software
Ramya Maaram—Associate Director
Ramya Maaram is the Scrum Master for the Federal Aviation Administration’s (FAA) Airspace Environmental Design Tool (AEDT)-- FAA’s regulatory model for air quality and aircraft noise emissions at civilian airports. AEDT is a complex software system that is built and maintained by a distributed team of software developers, subject matter experts, and testers and incorporates state-of-the art technologies, tools, frameworks, and databases to model aircraft noise and emissions. Ms. Maaram’s ability to lead the development of AEDT is built on her experience as a dynamic Senior IT Project Manager, Scrum Master, and Agile Coach with a proven track record of leading complex digital transformation programs involving planning, configuration, data migration, user training, and integration with existing systems. As Scrum Master for the AEDT development team, she fosters team and client collaboration, improves delivery efficiency, and implements governance practices that enhance organizational maturity and agility. As a certified PMP, SAFe RTE, SA, SASM, POPM, CSPO, and AWS Cloud Practitioner, Ms. Maaram blends strong technical knowledge with executive-level communication, enabling her to partner effectively with stakeholders at all levels. She is highly skilled in building and scaling Agile Program Management Offices, driving Agile adoption, and aligning cross-functional groups to deliver measurable business outcomes. With her wealth of experience, she functions as a trusted advisor to the FAA and provides guidance and support for the current and future development of AEDT. Ms. Maaram has a Master of Science degree in Electrical and Computer Engineering from Old Dominion University, Norfolk, VA.
Practice Area:
Air Quality, Aircraft Noise, and NEPA
Allison LaFleur—Consultant
Dr. LaFleur has experience with emissions inventories, Airports Council International’s Airport Carbon Accreditation (ACA) program, and studies related to microgrids, decarbonization, noise exposure, and contrails. She has also contributed to grant applications for the Federal Aviation Administration’s (FAA) Voluntary Airport Low Emissions (VALE) Program and the Zero Emissions Airport Vehicle (ZEV) and Infrastructure Pilot Program. She is proficient in numerous tools utilized in these studies, such as FAA’s Aviation Environmental Design Tool (AEDT) and the United States Environmental Protection Agency's (EPA) Motor Vehicle Emission Simulator (MOVES). In addition to her technical expertise, she brings strengths in programming, data analysis, and science communication to her work. Dr. LaFleur received her Bachelor of Science degree in Atmospheric Science and Bachelor of Arts degree in Mathematics from Vermont State University-Lyndon, and her Master of Science degree in Atmospheric Sciences and Ph.D. in Atmospheric Sciences from Purdue University.
Practice Area:
Software
Jim Moore—Senior Advisor
Mr. Moore has decades of experience as a senior software engineer/manager, system architect, and consultant with diverse experience in domains and project types. With RoVolus he has supported the Federal Aviation Administration’s (FAA) Airspace Environmental Design Tool (AEDT) software development team in various roles as the Agile Coach, the Product Owner, and the Scrum Master. As Product Owner he was responsible for managing product requirements in coordination with program managers and subject matter experts. He also oversaw development of the application by close coordination with the AEDT development team. As the Agile Coach for AEDT he supported program and team management to leverage the practices and principles of Agile software development with a focus on continuous improvement as well as acting as an advisor to our FAA clients. Mr. Moore is experienced with all phases of the Software Development Lifecycle for both Agile and Waterfall with seasoned technical, leadership and customer engagement skills. His domain experience includes simulation and modeling tools, streaming data collection and processing, eCommerce and web portals, systems integration, decision support, training and multimedia platforms. He has worked in a variety of environments supporting the design and engineering of software projects varying in scale from small standalone applications to large distributed and scalable systems. Mr. Moore received a Bachelor of Science degree in Computer Science from the State University of New York.