Graham Mullis was named CEO of Lab21 (Cambridge, Massachusetts). Graham joins Lab21 from Optivue Ltd., where he was a co-founder. Lab21 is a provider of healthcare and environmental diagnostic products and services.

Bob Calissendorff has been named CFO of Radlink (Redondo Beach, California). Formerly, Calissendorff was VP at Pacific Capital. Radlink makes medical imaging systems.

Richard Wagner was named president/CEO of SRU Biosystems (Woburn, Massachusetts). He most recently was executive VP of research at Praecis Pharmaceuticals. SRU Biosystems makes highly sensitive labeled and label-free detection technologies.