Arysta LifeScience has appointed Bill Lewis as head of global business initiatives. Mr Lewis has served as head of the company’s North America business unit for the past five years. He is succeeded in that post by Amy Yoder, who joined Arysta in September 2010 as head of strategic initiatives. Jim Spadafora has been appointed head of global product development. He joined Arysta in 2009 as North America product development manager for fungicides and fumigants.