Since then Lewent has also been responsible for Merck's collaboration with Johnson & Johnson in a consumer pharmaceuticals joint venture, for the setting up of the animal health company Merial (a joint venture with the French pharmaceutical company Sanofi-Aventis), and for Merck's ongoing relationships with AstraZeneca and DuPont.
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Joining Merck in 1980, Lewent pioneered a new planning model in 1983 based on the Monte Carlo method, as more traditional financial valuation methods seemed not to take account of the long-term nature of pharmaceutical risks.
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