REINACH, Switzerland - Stephan Sielaff has been named Chief Operating Officer of Archroma, a leader in color and specialty chemicals and the former textile, paper and emulsions businesses of Clariant. The new appointment will be effective in February of 2014.

Based in Reinach, Switzerland, Sielaff will oversee the global production, manufacturing and integrated supply chain activities for the business.

Sielaff brings to his new position diverse and global materials and process industry expertise. He has spent the past eight years with Symrise, most recently as the Senior Vice President Global Operations of the Flavor & Nutrition business. In that position, he oversaw the complete global supply chain operations, which he developed and implemented, for 26 sites in 20 countries. Previously, Sielaff held various roles in supply chain, innovation, engineering and marketing at Unilever.