1950s — The firm expands into manufacturing, electronics, chemicals, and energy; also, alerts communications industry to the promise of television. Postwar expansion brings numerous clients, including RCA, NBC, and Cessna.
1951 — Edwin G. Booz dies following a stroke.
1953 — The firm's first assignment outside the United States is a land-ownership study for the government of the Philippines.
1954 — Firm reviews private plane market for Cessna, helping define that industry.
mid-1950s — Firm receives contract for work on the Polaris nuclear submarine, and develops the PERT-i.e., "critical path"-system, a standard tool still in use today that identifies the critical path needed for on-time project delivery.
1955 — Booz Allen Applied Research, Inc. (BAARINC), forerunner of today's Worldwide Technical Business, is established as a new subsidiary for technical consulting and government contracting.
1956 — The firm creates its Booz, Allen & Hamilton International subsidiary.
1957 — Booz Allen and Johnson Wax co-author How to Organize for New Products, which introduces the Product Life Cycle concept— one critical piece of the firm's intellectual property. The article appears in the Harvard Business Review. Firm opens an office in Zurich, its first outside the United States.
1958 — Firm exceeds 300 employees. Sales reach $7 million.
1959 — TIME magazine calls Booz Allen 'the company doctors,' and 'the world's largest, most prestigious management consulting firm.
