Tomas Wiemer is a senior procurement and transformation leader with decades of sourcing experience across technology and indirect categories, specializing in M&A integration, carve-outs, procurement function buildouts, and digitally enabled source-to-pay operating models.
Most recently, as Procurement Digitalization Transformation Leader and Director of Indirect Procurement at Juniper Networks, he managed $800M in indirect spend across 2,500 suppliers in 45 countries — delivering a 10% rolling cost reduction — and led pre-integration procurement planning for the Hewlett Packard Enterprise merger.
Earlier, he led post-merger procurement integration and digitalization at Nokia following its acquisition of Alcatel-Lucent, served as Senior Director of Global and Americas Procurement at Alcatel-Lucent overseeing $4.5B in spend across 30 countries, and held procurement leadership roles at Lanxess, Sanofi, Solvay, and Firmenich, including two years as VP of Global Direct Procurement managing $1B in annual spend.
Tomas holds a Postgraduate Diploma in Digital Business from Emeritus (sponsored by MIT and Columbia University), a Master's in Control, Audit and Financial Reporting from Université Dauphine in Paris, a BA in Business Law from Université Panthéon-Assas in Paris, and completed INSEAD's Executive Management Development Program. He is fluent in English, German, and French, and is based in New Vernon, New Jersey. A member of the OnDemand Professional Network since 2009.









