US/Global 
CANAuthors & Presenters
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Ken Mattingly
Ken Mattingly is a retired classroom teacher with 27 years of experience. He has implemented classroom assessment for student learning for the past 15 years.
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Amy Tollefson
Amy Tollefson is the district-level principal with Osseo Area Schools in a diverse suburb of Minneapolis. Over more than 20 years, she has also served as a secondary school principal, secondary social studies teacher, district office coordinator, and assistant principal.
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