At Kalamazoo College I taught French conversation to students preparing for foreign study in France. I taught university-level mathematics courses at Western Michigan University from 1981-1983, while I was a graduate student. I also worked as a statistical consultant in the Mathematics Department's Statistical Consulting Laboratory, and assisted graduate students and faculty with the design and analysis of experiments. I also taught some introductory statistics courses at Joliet Junior College and at Waubonsee Community College.
As a US Peace Corps volunteer (1984-1986) in the Kingdom of Tonga, I provided expert technical assistance and served as the Chief of the Survey Division of Tonga's Statistics Department. I supervised 12 Tongan staff in the analysis of the 1984 Household Income and Expenditure Survey<PDF>, and derived per capita income figures, Lorenz curves and Gini indices of household income concentration for each of Tonga's five island groups, and for Tonga as a whole. I pretested the 1986 National Population Census in the field, and improved the Census questionnaire. I trained Census enumerators and district supervisors on several islands. I designed a questionnaire for the Census of Business, Industrial and Commercial Establishments, and I applied cluster sampling to design a Household Energy Consumption Survey for the Energy Planning Unit, Ministry of Lands and Surveys. I served as a lecturer and facilitator in the 1984 World Health Organization/National Epidemiology Workshop in Nuku'alofa and in Vava'u, and taught participants how to perform epidemiologic research and to present results. I helped participants to write papers based on their research, and assembled their papers into a proceedings book. I created an annual statistical report for Ministry of Health. I also ran with the Hash House Harriers, and played violin with the Tonga Morris Men.
After the Peace Corps, I traveled extensively in Asia, and worked as an English teacher in Bangkok, Taipei and Seoul. I taught conversation, composition, grammar and pronunciation to a wide variety of students at various ages and levels, from beginning children to advanced businessmen who wanted to sharpen conversational skills. I delivered classroom instruction, and devised and used a variety of teaching approaches, including student presentations, role-playing exercises and written communication skills. I developed specialized drills and taught the K.K. phonetic system.
During the 1980's, I worked as a Biostatistician in the pharmaceutical industry. At the Upjohn Company in Kalamazoo, I performed statistical analysis and wrote reports on prostaglandins in the treatment of ulcers. At DuPont Critical Care in Waukegan, I wrote reports and summaries in support of New Drug Applications (NDA's) and supplemental NDA submissions to U.S. Food and Drug Administration. I was responsible for the statistical considerations of the clinical design and preparation of randomization schedules.
From 1990 to 2008, I was a statistician with the US Federal Government.
At the US Census Bureau from 1990 to 1992, I estimated standard errors for the 1990 Census, and applied the Random Groups method <PDF> for Long-Form data. I designed tables of generalized design effects, and wrote computer specifications for creating the estimates and generating the tables. I evaluated the computer-system output and developed clearance procedures. I wrote the User's Guide for the tables and Appendix C: Accuracy of the Data for Census data products. I selected a sample of schools for the 1990 Census Education Project Evaluation in Puerto Rico. I evaluated <PDF> the 1990 Census Variance Estimation operations, and accomplished studies on reflecting the count adjustment population in sample data products; confidence intervals for medians<PDF>; and intra-cluster correlations for the Census.
At the US Consumer Product Safety Commission from 1992 to 1993, I performed statistical and epidemiologic work related to consumer product safety, and compiled official estimates of injuries, deaths and property loss due to fires associated with electrical consumer products.
I served as a mathematical statistician with the National Animal Health Monitoring System (NAHMS) of the United States Department of Agriculture (USDA) from 1993 to 2001. I participated in all phases of designing, implementing and analyzing NAHMS national surveys. I introduced innovative methods to the design of the national studies and to the weight adjustment methodologies, including raking for weight adjustment <PDF>, and propensity analysis <PDF> (applying logistic regression analysis to identify variables associated with non-response) for purposes of developing poststrata for nonresponse adjustment. Through ushering in the concept of designing descriptive report table shells at an early stage in survey development, and developing survey instruments that focused on the table shells, I succeeded in streamlining national survey methods and procedures <PDF>, resulting in the delivery of more timely and valuable products. I accomplished epidemiologic and economic research important to the dairy, pork, beef, catfish, equine, and poultry industries. Some of my research has been featured in the scientific literature. Multivariate analytic methods that I used included linear regression <PDF>, logistic regression <PDF>, and mixed models. I developed a Cobb-Douglas production function to examine returns to scale in the swine industry. To study economic interactions between feeding rates and stocking densities <PDF> in intensive catfish production, I applied a Just-Pope model <PDF>, with de Janvry's generalized power function to estimate the mean, and a Cobb-Douglas function to characterize the variance.
As the Project Administrator for the NAHMS Layers '99 Study, I organized and led a cross-functional team to address important issues in the US poultry industry. I established and maintained liaison with industry and professional groups, coordinated work, facilitated fortnightly team meetings, maintained timelines and reported decisions to keep the program proceeding according to plan.
I also held a collateral-duty position as the Asian Pacific Special Emphasis Program Manager with the agency's Equal Employment Opportunity Advisory Committee. I networked and built relationships with a wide variety of individuals and groups, including Colorado State University's Asian/Pacific American Student Services, the Northern Colorado Filipino-American Association, the Colorado Alliance for Minority Participation, and Harris Bilingual School. I recruited numerous speakers to give presentations at the agency, and twice served as a speaker myself. I led and organized the agency's participation in career fairs, and in the Louis Stokes Colorado Alliance for Minority Participation's Research Conference in the summer of 2000.
From 2001 to 2006, I was a statistician with the Nuclear Safeguards and Nonproliferation Division of New Brunswick Laboratory, which is situated on the campus of the Argonne National Laboratory in Argonne, Illinois. I computed estimates and uncertainties for assay and isotopic abundance measurements of certified nuclear reference materials, and wrote evaluations that formed the basis of nuclear reference material certificates. I introduced the GUM Workbench <PDF> to streamline procedures for uncertainty evaluation. I managed data for New Brunswick Laboratory's Safeguards Measurement Evaluation Program, and represented the Laboratory as a speaker at the Brazilian-Argentine Agency for Control and Accounting of Nuclear Materials 2004 Quality Assurance Workshop in Rio de Janeiro. I maintained the laboratory's quality-control data, and produced periodic summary reports (including updated QC limits). As the Computer Protection Program Manager for both classified and unclassified computer systems, I safeguarded the integrity of the laboratory's data by formulating policies and procedures consistent with Government orders and guidelines; ascertaining that security procedures were followed; performing risk assessments; developing contingency plans; certifying sensitive applications; and providing annual refresher training and training to new users.
I was the Lead Survey Statistician at the Defense Manpower Data Center (DMDC) in Arlington, Virginia from 2006 to 2008. I led a team of statisticians in frame development, sampling and weighting for surveys of Active Duty and Reserve members of the Armed Forces and their spouses; civilian employees; and Service Academy students. I identified numerous critical problems with the sampling and weighting procedures employed in DMDC surveys, and proposed workable solutions (Armed Forces & Society 2010,36(3):558-570).