Peter Johnson was the co-founder and CEO of Agouron Pharmaceuticals, Inc., which pioneered the field of protein structure-based drug design — an engineering approach to drug discovery. Propelled by its successful anti-HIV drug Viracept and a deep R&D pipeline of drugs for other viral diseases and cancer, Agouron became a fully integrated pharmaceutical firm with 1,500 employees and $470 million in revenue before being acquired by Warner-Lambert in 1999 for $2.1 billion, which became a subsidiary of Pfizer in 2000.