Dick Horst


President & Principal User Experience Specialist

Dr. Horst is an experimental psychologist and human factors engineer with extensive experience in applied behavioral research, systems development, and usability engineering. He founded UserWorks, as Man-Made Systems Corporation in September, 1989, and since then has been involved in all aspects of the company's technical work, business development, and management.

Bill Saiff


Vice President & Chief Operating Officer

Bill came to UserWorks after 11 years at Fannie Mae where he founded and directed the company’s User Research and Interaction Design Group, which was responsible for the user-interface design of over 70 B2B and B2C applications and web sites. At UserWorks, Bill provides seasoned leadership in managing our various UI design, user research, and user experience evaluation, testing, and strategy projects.

Weimin Hou


Senior User Experience Specialist

Weimin started working at UserWorks shortly after receiving her Ph.D. degree in Human-Computer Interaction at the University of Maryland Baltimore County in 2008. She has worked on a wide variety of projects, conducting user research and task analysis, developing information architecture (IA), prototyping wireframes, and carrying out usability evaluations. She is well-experienced with various user research techniques, such as usability testing, heuristic evaluation, in-depth interviews, persona development, card sorting, and web analytics data analysis.

Mark Becker


Senior User Experience Specialist

Mark is a User Experience Specialist at UserWorks, where he leads projects involving usability evaluations, task analyses, and other user research. He has also played a support role on a wide variety of projects, including accessibility reviews, ergonomic evaluations, mental modeling, and interface design and redesign efforts. Mark also has strong technical skills and has been valuable in maintaining and upgrading UserWorks’ lab equipment and office computer network.

Jake Bevitt


Project User Experience Specialist

Jake’s expertise is in user behavioral research, including experimental design, data collection, and data analysis. Skilled in many user experience evaluation methods, Jake has employed task analysis, card-sorting, persona creation, online surveys, expert reviews, and usability testing on a variety of projects. He is also practiced in design methods that involve HTML coding and various forms of prototyping, such as wireframing and paper prototyping. He holds a master’s degree in human factors and applied cognition from George Mason University (GMU).

Tristan Wilson


Senior User Experience Specialist

Tristan has an extensive background in behavioral and psycho-physiological research, with formal training in a range of methodologies from behavioral coding to electroencephalography (EEG). He is versed in web development, digital design and data analysis. At UserWorks, his work includes usability evaluation, user experience testing, user journey mapping, wireframing, prototyping, and accessibility remediation. Tristan holds a Master of Science degree in clinical psychological science from the University of Maryland, College Park.

Yasmin Diederiks


Staff User Experience Specialist

Yasmin has a background in cognitive psychology, human factors engineering, and behavioral research. She is pursuing her master’s degree in Human Factors and Applied Cognition from George Mason University (GMU), and she is projected to graduate in December of 2017. At UserWorks, she supports a variety of projects that involve usability evaluation and other user research, user interface design, participant recruitment, and literature review. She has supported usability testing projects examining websites, and mobile devices. Clients have included the United States Postal Service (USPS), AstraZeneca, the Food and Drug Administration (FDA), and the Substance Abuse and Mental Health Services Administration (SAMHSA).

Zach Dirazonian


Staff User Experience Specialist

Zach Dirazonian is a Human Factors graduate student and User Experience Specialist at UserWorks. At UserWorks Zach has been heavily involved in medical device usability testing. Prior to starting at UserWorks in June 2017, Zach interned at MedStar’s Human Factors division where he worked on several healthcare IT projects as part of their research team. Zach is currently a Master’s degree candidate in George Mason University’s Human Factors and Applied Cognition program where he is projected to graduate in December 2017. Zach received his B.A. in Psychology from the University of Massachusetts Amherst in 2015.

James McConnell

MS Expected

Staff User Experience Specialist

Jimmy has a research background in cognitive neuroscience, community psychology, and user centered design. At UserWorks, he supports projects that involve usability evaluation, research participant recruitment, and cross-team integration. He has supported usability testing projects examining websites and web applications. User research clients include Baltimore Center Stage, The Center for Medicare/Medicaid Services, and The University System of Maryland and Affiliated Institutions (USMAI). Jimmy is pursuing his master’s degree in Interaction Design and Information Architecture (M.S.) from the University of Baltimore.

Brenda Horst


Operations Manager

Since 1996, Brenda has served as Operations Manager for UserWorks, while also providing oversight to all participant recruitment activities. In her role as Operations Manager, Brenda is responsible for the day to day in-house company operations. She also oversees all aspects of participant recruiting, pitching in with recruiting herself when workload requires.

Naomi Brown

Administrative Assistant

Naomi is an Executive Assistant and Participant Recruiter at UserWorks, where she provides executive-level administrative support to the President and other office staff. She also acts as a Participant Recruiter by contacting and screening potential recruits for clients.