Alex Zinin has many years' experience in networking design, installation, support, and training. He started his career as a consultant and instructor for AMT Group, providing technical support for tier-1 ISPs, and training hundreds of professionals. Later, Mr. Zinin worked as the routing protocol escalation engineer for the ISP team at Cisco Systems, working closely with routing protocol developers and presenting at a number of Cisco events. Currently, Mr. Zinin is the senior routing software architect at Nexsi Systems, providing technical leadership for development of the new generation of IP routing software. An acknowledged routing and OSPF expert, he has coached many professionals for the CCIE exam and is active in IETF working groups and Cisco events.