Johnstone Supply Executive and Leadership Team

November, 2026

Leadership Overview

Johnstone Supply has 10 executives leading key functions including corporate strategy, financial oversight, regional operations, and human capital management.

Focused on empowering HVAC and refrigeration contractors, Johnstone Supply delivers essential equipment and technical training to drive professional excellence across the North American service industry.

Leadership Roles at Johnstone Supply

  • Chief Executive Officer - Michael Grimme
  • Chief Executive Officer - White Plains, NY - Tina Mutz
  • Chief Financial Officer - Josh O'Neill
  • President (Savannah) - Tim Cameron
  • State President (Volunteer) - Linda Fitzgerald
  • President (Greenville) - Mike Duncan
  • President (Arizona, Nevada & Mississippi) - Raj Hiremath
  • President, Integrator (The Heartland Group) - Justin Radke
  • Chief Marketing Officer, Supplier Management - Steve Porter
  • Chief Human Resources Officer - Stacy Cardwell
  • Michael Grimme - Chief Executive Officer

    Michael Grimme, the Chief Executive Officer at Johnstone Supply, directs the overarching corporate strategy for the wholesale distribution of HVAC and refrigeration equipment. Grimme architects long-term growth initiatives by aligning inventory procurement with the evolving technical requirements of contractors and service professionals. Overseeing the executive leadership team, the Chief Executive Officer ensures operational consistency across the national network. This role involves constant engagement with the Board to refine market positioning and enhance the value proposition for property maintenance clients. By prioritizing high-quality product availability and contractor training resources, Michael Grimme strengthens the competitive standing of the organization. The Chief Executive Officer maintains a focus on scaling distribution capabilities to meet rising demand for heating and cooling systems. Through rigorous performance monitoring, Grimme secures the financial health and operational efficiency necessary for sustained industry leadership in the competitive wholesale hardware sector.

    Tina Mutz - Chief Executive Officer - White Plains, NY

    Tina Mutz, the Chief Executive Officer - White Plains, NY at Johnstone Supply, directs regional operations and market expansion within the Northeast territory. Mutz architects localized strategies to ensure HVAC and refrigeration contractors receive timely access to essential equipment and installation supplies. Overseeing the regional distribution centers, the Chief Executive Officer - White Plains, NY maintains high service standards for property maintenance professionals. This role involves managing local vendor relationships and tailoring inventory to meet specific regional climate demands. By fostering strong partnerships with contractors, Tina Mutz drives revenue growth and enhances the brand presence in the area. The Chief Executive Officer - White Plains, NY coordinates with corporate leadership to implement national initiatives at the local level. Through efficient logistics management and a focus on customer support, Mutz ensures that the regional branch remains a critical resource for service professionals seeking reliable hardware solutions.

    Josh O'Neill - Chief Financial Officer

    Josh O'Neill, the Chief Financial Officer at Johnstone Supply, manages the fiscal health and capital allocation strategies for the wholesale distributor. O'Neill directs financial planning, reporting, and risk management processes to support the expansion of HVAC and refrigeration product lines. Overseeing the accounting and treasury functions, the Chief Financial Officer ensures that capital investments align with the company's mission to provide superior tools and equipment to contractors. This leadership role involves close collaboration with the executive team to optimize supply chain costs and improve profit margins across regional operations. By implementing robust financial controls, Josh O'Neill safeguards the organization against market volatility. The Chief Financial Officer drives initiatives that enhance cash flow and support the acquisition of new inventory technologies. Through precise fiscal oversight, O'Neill enables the company to maintain a dominant position in the property maintenance and hardware distribution markets.

    Tim Cameron - President (Savannah)

    Tim Cameron, the President (Savannah) at Johnstone Supply, directs regional operations and business development within the Savannah market. Cameron architects strategies to improve the distribution of HVAC and refrigeration components to local contractors and service professionals. Overseeing the daily operations of the regional branch, the President (Savannah) ensures that inventory levels meet the specific needs of property maintenance projects. This role involves building strong relationships with local clients and providing the technical support necessary for successful installations. By optimizing logistics and service delivery, Tim Cameron drives regional growth and enhances the company's reputation for reliability. The President (Savannah) coordinates with corporate leadership to implement national standards while maintaining a focus on local market nuances. Through effective leadership and a commitment to customer service, Cameron ensures that the Savannah branch remains a vital partner for contractors in the region.
    Tim Cameron

    Linda Fitzgerald - State President (Volunteer)

    Linda Fitzgerald, the State President (Volunteer) at Johnstone Supply, directs advocacy and community engagement efforts to support the wholesale distribution mission. Fitzgerald architects initiatives that connect the company with local contractor associations and industry groups. Overseeing the volunteer-led outreach programs, the State President (Volunteer) ensures that the organization remains a trusted partner for HVAC and refrigeration professionals. This role involves promoting the value of quality equipment and training resources to the broader service community. By fostering collaboration between the company and local stakeholders, Linda Fitzgerald enhances the brand's influence and market reach. The State President (Volunteer) works to align regional activities with the company's overarching goals of supporting property maintenance and hardware distribution. Through dedicated community involvement and strategic networking, Fitzgerald strengthens the company's position as a leader in the industry and a supporter of professional development for contractors.

    Mike Duncan - President (Greenville)

    Mike Duncan, the President (Greenville) at Johnstone Supply, directs regional operations and sales strategies within the Greenville market. Duncan architects plans to expand the distribution of HVAC and refrigeration equipment to local contractors and service professionals. Overseeing the regional branch performance, the President (Greenville) ensures that inventory and tools are readily available for property maintenance needs. This role involves managing local client relationships and providing technical expertise to support complex installations. By optimizing regional logistics and customer service, Mike Duncan drives revenue growth and strengthens the company's market presence. The President (Greenville) coordinates with corporate leadership to ensure that national initiatives are effectively executed at the local level. Through a focus on operational excellence and customer satisfaction, Duncan ensures that the Greenville branch remains a preferred partner for contractors seeking high-quality hardware and support services.
    Mike Duncan

    Raj Hiremath - President (Arizona, Nevada & Mississippi)

    Raj Hiremath, the President (Arizona, Nevada & Mississippi) at Johnstone Supply, directs multi-state operations and strategic growth across the Southwest and Southern regions. Hiremath architects regional plans to enhance the distribution of HVAC and refrigeration products to a diverse base of contractors. Overseeing the operations in Arizona, Nevada, and Mississippi, the President (Arizona, Nevada & Mississippi) ensures that inventory and technical resources meet the specific demands of these varied climates. This role involves managing regional logistics and fostering strong relationships with local service professionals. By optimizing supply chain efficiency and customer support, Raj Hiremath drives significant revenue growth and market penetration. The President (Arizona, Nevada & Mississippi) coordinates with corporate leadership to align regional activities with national objectives. Through effective leadership and a focus on operational scale, Hiremath ensures that the company remains a dominant force in the hardware distribution market across these key regions.
    Raj Hiremath

    Justin Radke - President, Integrator (The Heartland Group)

    Justin Radke, the President, Integrator (The Heartland Group) at Johnstone Supply, directs the integration of regional business units to ensure operational synergy and efficiency. Radke architects processes that streamline the distribution of HVAC and refrigeration equipment across the Heartland region. Overseeing the integration of various branches, the President, Integrator (The Heartland Group) ensures that all locations maintain consistent service standards for contractors and property maintenance professionals. This role involves aligning regional workflows with corporate systems to improve overall productivity and customer satisfaction. By focusing on operational integration and resource optimization, Justin Radke drives performance improvements and supports the company's growth objectives. The President, Integrator (The Heartland Group) collaborates with other regional leaders to share best practices and enhance the company's competitive edge. Through strategic oversight and a commitment to operational excellence, Radke ensures that the Heartland Group remains a highly efficient and effective part of the organization.

    Steve Porter - Chief Marketing Officer, Supplier Management

    Steve Porter, the Chief Marketing Officer, Supplier Management at Johnstone Supply, directs the strategic procurement of HVAC and refrigeration products while managing brand visibility. Porter architects relationships with key suppliers to ensure a consistent supply of high-quality tools and equipment for contractors. Overseeing the marketing department, the Chief Marketing Officer, Supplier Management develops campaigns that highlight the technical advantages of the company's inventory. This role involves analyzing market trends to anticipate the needs of service professionals in the property maintenance industry. By aligning supplier capabilities with customer demand, Steve Porter optimizes the product mix and drives sales performance. The Chief Marketing Officer, Supplier Management collaborates with regional leaders to ensure that marketing efforts support local growth objectives. Through effective brand positioning and supplier negotiations, Porter secures a competitive advantage for the organization in the wholesale hardware market.

    Stacy Cardwell - Chief Human Resources Officer

    Stacy Cardwell, the Chief Human Resources Officer at Johnstone Supply, directs the talent acquisition, development, and organizational culture initiatives for the wholesale distributor. Cardwell architects programs that equip employees with the skills necessary to support HVAC and refrigeration contractors effectively. Overseeing the human capital strategy, the Chief Human Resources Officer ensures that the workforce remains aligned with the company's mission of providing quality service and technical resources. This role involves managing performance management systems and fostering an environment of professional growth across all regional locations. By implementing comprehensive training and retention strategies, Stacy Cardwell strengthens the operational capacity of the organization. The Chief Human Resources Officer collaborates with the executive team to ensure that staffing levels meet the demands of the growing property maintenance market. Through strategic workforce planning, Cardwell supports the long-term success and stability of the company's diverse team.

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    Frequently Asked Questions Regarding Johnstone Supply Top Executives and Leadership Team

    Who leads Johnstone Supply?
    Johnstone Supply is led by Michael Grimme (Chief Executive Officer), along with executives such as Tina Mutz (Chief Executive Officer - White Plains, NY) and Josh O'Neill (Chief Financial Officer).
    Who is part of Johnstone Supply’s executive team?
    The executive team of Johnstone Supply includes leaders such as Michael Grimme (Chief Executive Officer), Tina Mutz (Chief Executive Officer - White Plains, NY), Josh O'Neill (Chief Financial Officer) and other senior executives.
    How many executives does Johnstone Supply have?
    Johnstone Supply has 10 executives leading key business areas.
    What roles are included in Johnstone Supply’s leadership team?
    The leadership team of Johnstone Supply includes roles such as Chief Executive Officer, Chief Executive Officer - White Plains, NY, Chief Financial Officer, President (Savannah), State President (Volunteer).