In-app ad-verification platform Pubguard has strengthened its leadership team with the appointment of the former president and chief operating officer of SYZYGY as its chairman.

Andy Stevens founded online media planning and buying agency Unique Digital in 2001, which he then sold to SYZYGY in 2010. Andy has a wealth of experience and has previously worked with a number of global blue chip clients, including Avis, Mazda and O2.