
Straight Line Theory
Minneapolis, MN
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Ann Arbor UX and CX research consultancy running qualitative, quantitative and mixed-methods studies for apps, web platforms, AI products and vehicles.
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Ann Arbor, MI
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TecEd Lighthouse plans and runs user experience research, from ethnographic studies, personas and stakeholder workshops to usability testing and statistical surveys. Its studies cover products such as mobile apps, web platforms, AI agents and automotive displays, and it frames findings around return on investment and business KPIs.
Stephanie Rosenbaum founded TecEd in 1967 as a technical documentation firm; it moved into human factors and interface design in the 1980s and into web and mobile testing in 1995. It has worked with Fortune 500 companies, startups, government agencies and nonprofits. The firm lists locations in Ann Arbor, Michigan and Palo Alto, California, and in 2026 ownership passed to its two co-managing directors.
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Minneapolis, MN
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San Francisco, CA
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Columbus, OH
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Pleasanton, CA
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