Rob Mionis

Since 2015, executing one of the most remarkable strategic transformations in the electronics manufacturing services (EMS) industry. When Mionis took over, Celestica was a struggling EMS provider competing primarily on cost in commodity manufacturing. He systematically repositioned the company toward higher-value, higher-margin segments — particularly data center infrastructure and networking equipment. This pivot proved prescient: as the AI infrastructure buildout accelerated from 2023 onward, Celestica emerged as a critical supplier of AI server assembly, high-speed networking switches, and rack-scale solutions for hyperscale cloud providers. The company's Connectivity & Cloud Solutions (CCS) segment, which serves hyperscaler data centers, has become the primary growth engine, with Celestica manufacturing networking hardware for major customers including a large networking equipment provider whose products are central to AI data center architecture. Under Mionis' leadership, Celestica's stock price increased by over 1,000% from its 2022 lows to 2025 highs, making it one of the best-performing AI infrastructure names globally. His decisions on capacity expansion to meet hyperscaler demand, customer concentration risk management, vertical integration into higher-value design services, and margin expansion as the product mix improves are the primary drivers of Celestica's stock performance.