Peter Wulff has been named CFO/vice president/treasurer of Alphatec Spine (Carlsbad, California). He served most recently as EVP/CFO of Artes Medical. Alphatec Spine, a wholly owned subsidiary of Alphatec Holdings, is a manufacturer of spine surgical products.

Kathy Blum has been named CEO of Applied Computational Technologies (Pittsburgh), a software development company focused on radiation treatment planning for cancer therapy. She has 27 years of device, service and IT-related experience.

Xiaoqing Liao has resigned as a director, CFO and secretary of China Sky One Medical (Harbin, China), a maker of pharmaceutical, medicinal and diagnostic products. He had joined the company in March and was named CFO last month.