Lewis was promoted to associate professor in 1997 and to professor in 2003. In 2002, she co-edited the book Polymers in Particulate Systems: Properties and Applications to which she also contributed a chapter titled "Colloid-filled Polymer Gels: a Novel Approach to Ceramics Fabrication".[4] In 2006 Lewis was named interim director and subsequently became director of UIUC's Frederick Seitz Materials Research Laboratory in 2007.[2][5]