Leadership

	President
	Peter A. Irwin, Ph.D., P.Eng. Peter joined the company in 1980 and became the President of RWDI in 1999. His experience in wind engineering dates back to 1974 and includes extensive research and consulting in wind loading, aeroelastic response, wind tunnel methods, and instrumentation. His previous experience includes six years of wind engineering work as a research officer with Canada's National Research Council and two years with the Royal Aircraft Establishment in Farnborough, Great Britain. Peter earned his Ph.D. in Mechanical Engineering from McGill University. He is a Registered Professional Engineer in the Province of Ontario. He has published over 100 papers and won several awards for his work, including the Canadian Society for Civil Engineering's Gzowski Medal in 1995. He serves on several committees for codes and standards, such as the Standing Committee on Structural Design for the Canadian Building Code and the wind committee of the US ASCE 7 standard.
	Vice-President
	Mark Vanderheyden, M.Eng., P.Eng. Mark joined RWDI in 1989 and became a Principal of the firm in 2000. He graduated from McMaster University in 1989 with his M.Eng. in Engineering Physics. Since joining RWDI, he has coordinated a large number of major air quality projects involving numerical modeling, exhaust dispersion, and fluid modeling. As a Project Director, Mark is responsible for obtaining and administering environmental projects. He also acts as the team liaison, provides technical direction to the project engineers and scientists, ensures that quality assurance and control measures are followed, and makes certain that projects are completed according to the agreed upon schedule and budget. In addition to being a Project Director / Principal for RWDI, Mr. Vanderheyden became a Director of RWDI West Inc. in 1999.
	Project Director / Principals
	David S. Chadder, Hon. B.Sc., QEP David is a Principal and Project Director at RWDI with experience in environmental consulting dating back to 1978. His area of specialty involves air quality and noise assessments, permitting, emissions testing, and ambient air quality monitoring surveys.  David supervises engineering teams that provide detailed air quality, odor, risk and noise studies as part of provincial or federal regulatory requirements, air emission inventories, dispersion modeling and mitigation design over a broad range of applications. These include municipal and hazardous waste landfills, pipeline transmission, roadways, airports, industrial facilities, hospitals and power plants.  He has appeared as an expert witness providing testimony before the NEB, EAB and OMB.  He is a member of the Air and Waste Management Association (AWMA), the Solid Waste Association of North America (SWANA), Association of Power Producers of Ontario (APPRO), and the Canadian Meteorological and Oceanographic Society (CMOS). David is accredited as a Qualified Environmental Professional (QEP).
	Mike Lepage, M.Sc., CCM Mike joined RWDI in 1981, became an Associate of the firm in 1988 and became a principal in 2003. As a Project Director, he provides overall direction on air quality and meteorological projects, ensuring that a high level of service is provided and, at the same time, RWDI's interests are preserved on all projects.  Mike also oversees RWDI regional atmospheric modeling group, which is involved in high-end numerical modeling of regional air pollutants such as ground-level ozone and fine particulate matter. Since joining RWDI, Mike has been involved in a wide variety of projects related to air quality, wind engineering, and meteorology, and frequently provides expert testimony and review.  Major research projects in Air Quality include: simulating the dispersion of nerve agents at a military air base; simulations of turbulence and dispersion around buildings; fugitive dust emissions in the wood products industry; dispersion of emissions at the portals of roadway tunnels; dust control at mine tailings ponds; and simulation of peak concentrations in fluctuating plumes.  In recent years he has been extensively involved in regional modeling of meteorology and atmospheric chemistry to investigate large scale smog events, using models such MM5, Models-3/CMAQ, SAQM, CALGRID and CALPUFF.
	Project Directors
	Derek Louch, Ph.D. Derek joined RWDI AIR Inc. in 2001 as an expert in advanced flow physics.  Since arriving he has established an advanced Computational Flow Physics group focused on developing commercial software, coined Virtual Laboratory Assistants, for the architectural wind engineering community.
	Dr. Kathy Preston, Ph.D. Kathy is a Project Director for RWDI's Vancouver office.  In this role, she is responsible for technical direction and quality for air quality, odour and risk assessments.  She is an atmospheric chemist and a professional engineer.  She brings a wealth of experience as the former head of the air quality group in a major national consulting company in their Calgary office.  She has experience in environmental assessments for the oil and gas, mining, power, transportation and forestry sectors.  She has been involved in policy studies for Environment Canada, the BC Ministry of Water, Land and Air Protection, and the Government of the Northwest Territories.  She has been retained by the Natural Resources Conservation Board (NRCB) in Alberta as an advisor on odour issues.  She has participated in numerous public consultation meetings, including open houses, townhall and smaller formats, and has provided expert testimony at Alberta Energy and Utilities Board hearings.