Agoura Hills-based BeyondTrust, a developer of security software, has added Brian T. Anderson as Chief Marketing Officer, the firm said today. BeyondTrust said that Anderson joins the firm from SIderean Software, and also served at Avamar Technologies, IBM Tivoli, Access360, HNC Software, and FileNet. BeyondTrust develops software used to control and monitor access to enterprise applications and other resources.