JENNMAR Executive and Leadership Team

October, 2026

Leadership Overview

JENNMAR has 4 executives leading key functions including strategy, financial oversight, operational management, and global market expansion.

Driven by a commitment to safety and engineering excellence, JENNMAR delivers advanced ground control solutions for mining, tunneling, and civil construction sectors while maintaining a global footprint in infrastructure development.

Leadership Roles at JENNMAR

  • Chief Executive Officer - Michael Calandra
  • Chief Financial Officer - Tim Maziarz
  • President - Brian Delloma
  • President, Global Soft Rock - Michael Portwood
  • Michael Calandra - Chief Executive Officer

    Michael Calandra, the Chief Executive Officer at JENNMAR, directs the overarching strategic vision for this global manufacturing and engineering enterprise. Calandra architects long-term growth initiatives while overseeing the integration of ground control products across mining, tunneling, and civil construction markets. By aligning corporate resources with the specific safety requirements of demanding underground environments, the Chief Executive Officer ensures consistent operational excellence. Michael Calandra maintains direct oversight of the executive leadership team to foster innovation in steel structures and resin product development. This leadership role involves navigating complex international infrastructure landscapes to expand the company's market reach. Through rigorous focus on performance metrics and technical expertise, the Chief Executive Officer drives the organization toward sustainable success. Calandra prioritizes the delivery of reliable support systems that enhance stability for clients worldwide, solidifying the company's position as a leader in specialized construction solutions.

    Tim Maziarz - Chief Financial Officer

    Tim Maziarz, the Chief Financial Officer at JENNMAR, manages the fiscal health and capital allocation strategies for the entire manufacturing organization. Maziarz oversees global financial reporting, risk management, and budgetary planning to support the company's extensive network of affiliates. By analyzing market trends in mining and civil construction, the Chief Financial Officer optimizes resource distribution to maximize operational efficiency. Tim Maziarz collaborates with the executive team to evaluate investment opportunities in custom fabrication and engineered support systems. This role involves maintaining robust financial controls that enable the company to scale production capabilities across diverse geographic regions. Through precise financial modeling and strategic oversight, the Chief Financial Officer ensures the long-term viability of all infrastructure projects. Maziarz drives fiscal discipline, allowing the organization to maintain a competitive edge while delivering high-quality ground control solutions to clients operating in challenging environments.
    Tim Maziarz

    Brian Delloma - President

    Brian Delloma, the President at JENNMAR, executes the daily operational strategies required to maintain the company's status as a premier provider of ground control products. Delloma oversees the manufacturing processes and engineering workflows that produce steel structures and resin products for the mining and tunneling industries. By coordinating with regional managers, the President ensures that field applications meet the rigorous safety standards expected by civil construction partners. Brian Delloma drives the implementation of technical expertise across all project phases, from initial consultation to final installation. This leadership role involves streamlining production lines to improve output quality and operational stability. Through active management of internal resources, the President supports the company's mission to provide reliable support systems in demanding environments. Delloma focuses on enhancing the efficiency of the global supply chain, ensuring that the organization consistently meets the complex needs of infrastructure markets worldwide.

    Michael Portwood - President, Global Soft Rock

    Michael Portwood, the President, Global Soft Rock at JENNMAR, directs the specialized division focused on ground control solutions for soft rock mining applications. Portwood oversees the development and deployment of engineered support systems tailored to the unique geological challenges found in these specific mining environments. By driving innovation in resin products and custom fabrication, the President, Global Soft Rock ensures that the company provides superior safety and performance for underground operations. Michael Portwood manages the expansion of these specialized services across international markets, ensuring consistent quality and technical support. This leadership role involves close collaboration with engineering teams to refine product designs based on field application feedback. Through strategic focus on the soft rock sector, the President, Global Soft Rock enhances the company's overall market impact. Portwood secures operational stability for clients by delivering reliable, high-performance solutions that address the specific demands of soft rock extraction.

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    Frequently Asked Questions Regarding JENNMAR Top Executives and Leadership Team

    Who leads JENNMAR?
    JENNMAR is led by Michael Calandra (Chief Executive Officer), along with executives such as Tim Maziarz (Chief Financial Officer) and Brian Delloma (President).
    Who is part of JENNMAR’s executive team?
    The executive team of JENNMAR includes leaders such as Michael Calandra (Chief Executive Officer), Tim Maziarz (Chief Financial Officer), Brian Delloma (President) and other senior executives.
    How many executives does JENNMAR have?
    JENNMAR has 4 executives leading key business areas.
    What roles are included in JENNMAR’s leadership team?
    The leadership team of JENNMAR includes roles such as Chief Executive Officer, Chief Financial Officer, President, President, Global Soft Rock.