Jack Ashworth is professor of music history and director of the Early Music Ensemble; he has taught at U of L since 1977. Primarily a harpsichordist, he also plays early string and wind instruments such as the recorder and viola da gamba. He has served on music workshop faculties in the United States, England, Canada and Australia and is past president of the Viola da Gamba Society of America; he received the Thomas Binkley Award for Outstanding Achievement by a Collegium Director in 1999. Jack has performed with Wieland Kuijken, Fretwork and Trio Settecento, among others; he wrote the article on "Keyboard Instruments" in A Performer's Guide to Renaissance Music as well as co-authoring (with Paul O'Dette) articles on basso continuo in both this volume and the companion A Performer's Guide to Seventeenth-Century Music. Running the Numbers, a handbook on continuo realization for keyboard players he co-authored with Frances Fitch, was published in 2011.