Self Employed, Convex logic, Ottawa, ON
- Completed numerous
contracts with Environment Canada in the area of air pollution data
analysis and research.
- Specialized in researching source-receptor
relationships and how weather and air flow patterns influence air
pollution levels across Canada.
- Developed SAS routines to generate annual
summary reports of air pollution measurements data from hourly data
stored in Microsoft SQL Server database.
- Developed air flow clustering software to
identify most frequently occurring weather patterns and investigated
connection between weather patterns and air pollution (primarily ozone
and particulate matter) levels across Canada.
- Conducted data analysis on observed and
modelled mercury concentration data to assist in mercury dry deposition
elevated air pollution events in western Canada to determine the cause
(anthropogenic, forest fire, etc.).
- Authored or co-authored several research papers
published in leading atmospheric science journals and authored reports for
internal Environment Canada use.
- Results of my research have been used in developing
and evaluating public policy and regulations.
- Wrote custom data analysis software in FORTRAN
and C primarily in a UNIX/Linux environment.
- Have developed and maintain the largest
database of advanced hockey statistics on the internet at
Software Developer, Macadamian Technologies Inc.,
September 2000-June 2002
- Worked as part of a small software
development team developing Linux, Windows and Mac device drivers and
utility software for a client.
- Developed software in C and C++ for Linux and
- Took on a project lead role and became the
technical point of contact for the client.
Software Engineer, ATI Technologies Inc. (now AMD Inc.),
January 1999-August 2000
As a member of the
Developer Relations team I liaised with third party developers to assist them
in developing software products that maximized the power of ATI's graphics
Developed graphics device driver software for SCO Unix, AIX, and Linux operating systems.
Acted as a technical point of contact for the Linux open source community.
Attended several trade shows and conferences to meet with 3rd party developers and promote ATI products.
Programmer/Data Analyst (contract), Environment Canada,
March 1997-December 2008
Utilized my software development skills to write programs to perform data analysis and research.
Researched source receptor relationships through analysis of air flow patterns.
Results of my research assisted in developing public policy and published in leading scientific journals.
Developed data analysis software in FORTRAN and C.
Associate Software Engineer, ATI Technologies Inc. (Now
AMD Inc.), Thornhill, ON
June 1996-March 1997
Developed device driver and utility software in MS DOS and SCO UNIX.
Was contracted by ATI Technologies Inc. in December 1997 to maintain SCO UNIX graphics driver.
Zhang, L., Blanchard, P., Gay, D. A., Prestbo,
E. M., Risch, M. R., Johnson, D., Narayan, J., Zsolway, R., Holsen, T. M.,
Miller, E. K., Castro, M. S., Graydon, J. A., Louis, V. L. St., and Dalziel,
J.: Estimation of speciated and total mercury dry deposition at monitoring
locations in eastern and central North America, Atmos. Chem. Phys., 12,
4327-4340, doi:10.5194/acp-12-4327-2012, 2012.
Zhang L, Blanchard P, Johnson D, Dastoor A,
Ryzhkov A, Lin CJ, Vijayaraghavan K, Gay D, Holsen TM, Huang J, Graydon JA,
St Louis VL, Castro MS, Miller EK, Marsik F, Lu J, Poissant L, Pilote M,
Zhang KM. Assessment of modeled mercury dry deposition over the Great Lakes
region. Environ Pollut. 2012 Feb;161:272-83. Epub 2011 Jun 25. PubMed PMID:
David Johnson, Domenico Mignacca, Dennis
Herod, Dan Jutzi, Heather Miller. Characterization and Identification of
Trends in Average Ambient Ozone and PM2.5 Levels through Trajectory Cluster
Analysis in Eastern Canada. Journal of Air & Waste Management
Association, Vol 57 2007. Pp 907-918.
Jeffrey R. Brook, David Johnson. Identification
of representative warm season periods for regional air quality (ozone) model
simulations. Atmospheric Environment, Vol. 34(10) 2000. Pp. 1591-1599.
Jeffrey R. Brook, David Johnson, Alexandre
Mamedov. Determination of the Source Areas Contributing to Regionally High
Warm Season PM2.5 in Eastern North America. Journal of the Air & Waste
Management Association, Vol 54 2004. Pp 1162-1169.
Jeffrey R. Brook, Leiming Zhang, Yifan Li,
David Johnson. Description and evaluation of a model of deposition
velocities for routine estimates of dry deposition over North America. Part
II: review of past measurements and model results. Atmospheric Environment,
Vol 33(30) 1999. Pp 5053-5070.