Masin graduated from Maple Heights High School in Maple Heights, Ohio, then went on to Valparaiso University in Valparaiso, Indiana, where she majored in Government, and minored in Economics, earning a B.A. in 1964.
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Active in her community and in local government through the years, Masin was a member of the Eagan City Parks Commission from 1981–1989, was a member of the board of commissioners of the Minnesota Valley Transit Authority from 1993–1999, serving as vice chair in 1994, was a member of the Transportation Committee of the Association of Metropolitan Municipalities in 1993, was a representative to Independent School District 191, and is a member of the Minnesota Women's Political Caucus.
Sandra Day O'Connor | Sandra Bullock | Sandra Bernhard | Sandra McCracken | Sandra Day O’Connor | Sandra Cisneros | Sandra Oh | Sandra-Helena Tavares | Sandra Dee | Sandra Sully | Sandra St. Victor | Sandra Steingraber | Sandra Maischberger | Sandra Kim | Sandra Day O'Connor United States Courthouse | Sandra Cisneros's | Sandra | Sandra Tsing Loh | Sandra Nurmsalu | Sandra Lerner | Sandra Harding | Sandra Dickinson | Sandra Dallas | Sandra Boynton | Rush Limbaugh–Sandra Fluke controversy | We'll Be Together (Sandra song) | The Party's Over (Sandra Reemer song) | Sandra Zimmerli | Sandra Zaiter | Sandra Voe |