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The ACET Team

ACET is a woman- and minority-owned small business enterprise based in Minneapolis, Minnesota. Our staff have extensive experience in conducting high-quality research and evaluation in a variety of settings.


See the bios below to learn more about each ACET team member.

Stella SiWan Zimmerman

President, Founder,
Chief Executive Officer

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Stella’s specialty in culturally tailored evaluation projects has continued to grow with ACET during her 25-year career as president of ACET, Inc. She has a M.S. in Policy Analysis and Program Evaluation.

Kamarrie Coleman

Department Manager,

Evaluation & Research

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Kamarrie’s extensive experience includes working with culturally and linguistically diverse PK-16 educational institutions. She earned a Ph.D. in English as a Second Language Curriculum and Instruction.

Ashley Kitchen

Senior Evaluation Specialist,

Quality Improvement Lead

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Ashley’s experience in collaborations with Black, Indigenous, and People of Color (BIPOC) communities strengthens ACET’s high-quality qualitative research. She has a Ph.D. in Politics and International Relations.

Rachel Engh

Senior Evaluation Specialist,

 Cross-sector Lead

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Rachel’s specialty in designing participatory and equitable mixed-methods evaluation approaches, helps clients understand and communicate impact. She has a M.A. in Urban and Regional Planning.

Carlos Gallego

Senior Coordinator

Outreach and Cultural Connector

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Carlos’ community relationship building and grassroots experience allows him to successfully bridge underserved communities with cultural connections. He has a M.Ed. in Elementary Education.

Mick Alvarez Flores

Senior Graphic Design

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Mick’s background in graphic design and illustration, brings her expertise in digital and print media, visualizing and creating graphics, illustrations, logos, layouts and photos. She has a B.A. in Graphic Design.

Will Hopkins



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Will’s experience in data collection, analysis, quality improvement, and presentation is beneficial to a variety of ACET projects. He holds a B.A. in Urban Studies. 

Charles Rivers

Program Support Coordinator and Facilitator


Charles’ expertise lies in supporting organizations with their Diversity, Equity, and Inclusion journeys, as well as enhancing youth engagement and development. He holds a B.S. in Applied Ethics with a minor in Anthropology.

Trisha Netsch Lopez

Research Program Services Specialist


Trisha’s specialty is in qualitative research methods, bringing extensive experience working with culturally appropriate health services. She earned a Ph.D. in Anthropology and a M.S. in Public Health.

Maggi Seybold



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Maggi’s experience in learning strategies, program oversight, and internal communications brings a medical perspective to ACET projects and operations. She has a M.S.B.S. in Physician Assistant Studies and a B.S. in Exercise Science.

DeResha Vaughan

Planning & Research Coordinator

Barbara Tan



DeResha’s technology, planning, and research skills enhances ACET through her efficiency and engaging people in team settings. She has a B.A. in Classics.

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Barbara specializes in research and statistics, particularly in academic and healthcare settings, to support data analysis and collection. She has a B.S. in Biology and Psychology with a minor in Spanish.

Bree Zimmerman

Assistant to

Operations Team

Conor Hanson

Research and Data


Emily Serkaian

Finance Assistant 

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Bree specializes in facilitating and planning meetings, health and wellness events, with a focus on accessibility and disability services. She has a A.A. in Liberal Arts with an emphasis in Human Services.


Conor specializes in data analysis using multiple programming languages to tell meaningful stories with data. He holds a B.A. in Philosophy and a certificate in Data Analysis & Visualization.

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Emily specializes in human resource administration, financial management, and organizational development. She earned a M.S. in Industrial and Organizational Psychology and a B.A. in both Economics and Management, and Psychology.

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