Yoon Ah joined CAL in Jan 2020. She has been primarily working on WIDA ACCESS Writing assessment, Kindergarten Screener projects, and standard-setting of Best Literacy/Plus.

Yoon Ah holds a PhD in Educational Measurement and Statistics and a BA in Psychology. Her research interest lies in improving the psychometric properties of performance-based assessments. Before coming to the US, Yoon Ah worked as a project manager at Korean University Accreditation Institute.