Gina Centrello, president and publisher of Ballantine Books, has made some management changes at Del Rey Books, appointing Betsy Mitchell v-p and editor-in-chief of the imprint. Mitchell, previously editor-in-chief of Warner's science fiction and fantasy imprint, Aspect, will join Del Rey January 2.

Mitchell will oversee all editorial operations of Del Rey and will also edit and acquire books. Del Rey's editorial staff has been reporting to Kuo-Yu Liang, who had been associate publisher. Liang has been given the new position of marketing director of Del Rey and licensing developments and he will report to Anthony Ziccardi, v-p, sales marketing director. Shelly Shapiro, editorial director, and Steve Saffel, executive editor, will report to Mitchell.