Foster is an ISA employee who arranges travel for agents on missions via a commercial travel agency. He is responsible for sending Sameen Shaw and Michael Cole to New York City, where Cole was killed. (“Relevance”)
Finch sends Shaw to meet her former ISA associates so she can learn more about Owen Matthews, a person of interest. Shaw arrives at the travel agency and interrogates Foster about Owen. Foster admits that he made Owen's travel arrangements and placed another ISA operative, codenamed Indigo 6A and Shaw's successor, on the flight. (“4C”)