I'm an atmospheric scientist studying the sources, sinks, distributions, and changes in the abundance of trace gases in the global atmosphere. I've been employed in this area for over 20 years, making long-term measurements of trace gases that cause ozone depletion and affect climate. My goal in making contributions to Wikipedia is to improve the accuracy of entries where needed, and to keep the information in Wikipedia pages up-to-date based on new scientific understanding as it becomes available.