Complex Plant Manager

About the role

Johns Manville is a leading manufacturer and marketer of premium-quality insulation and commercial roofing, along with glass fibers and nonwovens for commercial, industrial and residential applications. Our products are used in a wide variety of industries including building products, aerospace, automotive and transportation, filtration, commercial interiors, waterproofing and wind energy. A proud member of the Berkshire Hathaway family of companies, we serve customers in more than 80 countries around the globe. We are committed to delivering positive and powerful experiences, because we are successful only when our employees and customers thrive. We are passionate, we care about people, we perform at a superior level, and we protect others and our environments. Pay Range $181,300.00-$249,300.00 Annual This is the base salary pay range that an applicant can expect to make upon hire. Pay within this range will vary based upon relevant experience, skills, and education among other factors. In addition, this position is eligible for an incentive bonus. The Complex Plant Manager is accountable for the overall operating performance of JM's Defiance manufacturing complex-one of the company's largest, most complex, and most visible operations. This role leads two manufacturing facilities, offsite warehouse and a customer service building, ensuring these operations consistently deliver safe, reliable, high‑quality, and cost‑competitive products that support both internal and external customers. The Defiance complex is the sole producer of marbles, fiberglass pipe covers, and several critical OEM and performance material product lines, supplying multiple JM plants and external customers. The Plant Manager must sustain operational excellence while leading significant capital investments including furnace rebuilds, automation initiatives, and potential expansion projects. Success in this role is defined by the ability to improve safety performance, increase engagement, raise throughput, improve quality, strengthen financial results, and execute capital projects on time and on budget-all while leading a unionized workforce of 600+ hourly and 60+ salaried employees in a highly visible, multi‑site environment. Key Performance Outcomes The Plant Manager is expected to: Safety & Environmental Performance Achieve year‑over‑year improvement in safety metrics, ensuring the Defiance complex meets or exceeds JM safety, health, and environmental commitments. Maintain full regulatory compliance while reducing risk through proactive hazard identification, strong safety culture, and disciplined operating practices. Operational Excellence Improve plant productivity, throughput, yield, and uptime through disciplined execution of lean manufacturing and continuous improvement systems. Ensure Defiance remains a reliable, high‑quality supplier to internal JM plants and external customers, improving customer satisfaction and reducing quality escapes. Balance short‑term operational demands with long‑term process stability and asset reliability. People & Culture Build and sustain an engaged, accountable, performance‑driven culture aligned with JM values. Develop leaders and succession pipelines by coaching, setting clear expectations, and holding leaders accountable for results. Effectively lead within a union environment, maintaining productive labor relations while driving performance. Financial Performance Deliver annual operating results against budget and forecast, including cost, working capital, and inventory performance. Translate financial analysis into actionable operating decisions that improve profitability and asset efficiency. Capital & Strategic Execution Lead major capital programs-including furnace rebuilds, automation, and capacity expansions-delivering projects safely, on schedule, and within approved funding. Improve plant efficiency and strategic flexibility through disciplined evaluation and execution of capital investments. Systems, Governance & Reporting Establish and maintain robust operating metrics, management routines, and reporting systems that drive accountability and continuous improvement. Partner with senior leadership to align site execution with both near‑term business priorities and long‑range strategic objectives. External Leadership Serve as the primary representative of JM for the Defiance complex with community stakeholders, regulatory agencies, customers, and corporate leadership. Why This Role Stands Out: Enterprise‑Critical Leadership Role: Lead one of JM's largest, most complex, and most visible manufacturing complexes with direct impact on network‑wide supply and performance. True Scale and Accountability: Full responsibility for a multi‑site, capital‑intensive operation with 600+ hourly and 60+ salaried employees, multiple unions, and diverse product lines. Transformation Opportunity: Drive major capital investments-including furnace rebuilds, automation, and potential e

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