This volume presents a collection of papers on the contributions, achievements, and progress of women mathematicians, mostly in the 20th and 21^st centuries, emerging from the themed contributed paper session "The Contributions of Women to Mathematics: 100 Years and Counting" at Math Fest 2015, sponsored by the Association for Women in Mathematics to celebrate the 100th anniversary of the Mathematical Association of America. As such, the collection contains a diverse mix of current scholarship and exposition related to women and mathematics rather than a balanced coverage of...