• 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.