A classically-trained research scientist, Stieger has 30 years of experience in conducting marketing and public opinion research and is an acknowledged expert in research design and statistical analysis.  He specializes in the application of rigorous analytic techniques ‑‑ such as multivariate analysis and behavioral modeling ‑‑ to problems in marketing and communication. 

Prior to forming GLS Research in 1989, he served as Vice President and Director of Research Operations for Research and Decisions Corporation, a San Francisco-based market and public opinion research company.  From 1976 to 1982, Stieger was a senior researcher at SRI International (Stanford Research Institute) where he conducted numerous social welfare program and policy studies.

Stieger earned a Masters of Urban Planning from San Jose State University in 1976 and a B.A. in Business Administration from Florida Atlantic University in 1971.

Aaron Percefull, Executive Vice President

Percefull brings 20 years of experience in marketing, public opinion, and political research to his direction of the day-to-day activities of the research operations. 

Before coming to GLS Research, he was senior research analyst at Research and Decisions Corporation, where he managed a broad range of qualitative and quantitative research projects for manufacturing firms, retail establishments, health care providers, public agencies, and political campaigns.  Prior to moving to San Francisco in 1987, Percefull served as project director on several packaged goods and telecommunications accounts at Oxtoby-Smith, a marketing research firm in New York City.  From 1984 to 1986, Percefull served as a public opinion research analyst for Carl Byoir and Associates, an international public relations firm.

Percefull earned an M.A. in English and Comparative Literature from Columbia University in 1971, and an A.B. in English from the University of Illinois in 1970.  He is a member of Phi Beta Kappa and is a Fulbright scholar.