Resonac Executive and Leadership Team

August, 2026

Leadership Overview

Resonac has 9 executives leading key functions including strategy, financial oversight, human capital, technology, and operational management.

Driven by a commitment to chemical innovation, Resonac delivers advanced materials for the semiconductor, mobility, and electronics sectors while maintaining a robust international presence across Asia and global markets.

Leadership Roles at Resonac

  • President & Chief Executive Officer (Asia) - Hidemitsu Arai
  • Chief Financial Officer & Treasurer - Tomoe Kalnay
  • Managing Corporate Officer, Chief Financial Officer - Hideki Somemiya
  • Chief Financial Officer, Graphite Business Unit - Taku Tanaka
  • Chief Human Resources Officer - Giwon Park
  • Corporate Officer, Chief Technology Officer - Masato Fukushima
  • Deputy Chief Human Resources Officer - Shingo Maeda
  • Principal, Office of the CSO and Chief Revenue Officer - Atsushi Doi
  • Chief Operations Officer - Norbert Gaar
  • Hidemitsu Arai - President & Chief Executive Officer (Asia)

    Hidemitsu Arai, the President & Chief Executive Officer (Asia) at Resonac, directs the strategic expansion of chemical operations across the Asian market. Arai architects high-level growth initiatives within the Semiconductor and Electronic Materials segments to ensure competitive positioning. By coordinating with regional leadership, the President & Chief Executive Officer (Asia) optimizes supply chain efficiency and strengthens market penetration. This leadership role involves aligning corporate objectives with local regulatory requirements to maintain operational excellence. Hidemitsu Arai directly influences the long-term profitability of the regional business units through rigorous performance monitoring. Arai fosters collaboration between the Mobility and Innovation Enabling Materials divisions to capture emerging market opportunities. Through disciplined management of regional assets, the President & Chief Executive Officer (Asia) secures sustainable growth for the organization. Arai maintains a focus on technological integration to support the evolving needs of the global electronics industry.

    Tomoe Kalnay - Chief Financial Officer & Treasurer

    Tomoe Kalnay, the Chief Financial Officer & Treasurer at Resonac, manages the global capital structure and liquidity requirements for the chemical enterprise. Kalnay oversees treasury operations, ensuring the availability of funds for research and development in the Innovation Enabling Materials segment. By implementing robust financial controls, the Chief Financial Officer & Treasurer mitigates fiscal risks associated with international market volatility. This role involves frequent engagement with the Board to report on capital allocation strategies and investment returns. Tomoe Kalnay drives the financial planning process to support the company's expansion into new chemical markets. Kalnay monitors cash flow across all business segments to maintain a healthy balance sheet. Through precise financial forecasting, the Chief Financial Officer & Treasurer provides the necessary data for informed decision-making. Kalnay ensures compliance with international accounting standards while optimizing the tax structure to enhance shareholder value across the global organization.
    Tomoe Kalnay

    Hideki Somemiya - Managing Corporate Officer, Chief Financial Officer

    Hideki Somemiya, the Managing Corporate Officer, Chief Financial Officer at Resonac, directs the overarching financial strategy and corporate reporting functions. Somemiya architects the long-term fiscal roadmap, focusing on the profitability of the Chemicals and Mobility segments. By analyzing market trends, the Managing Corporate Officer, Chief Financial Officer ensures that capital investments align with the company's core mission of chemical innovation. This leadership role involves coordinating with other C-suite executives to evaluate the financial viability of new product launches. Hideki Somemiya maintains rigorous oversight of corporate expenditures to drive operational efficiency. Somemiya manages investor relations, communicating the financial health and strategic direction of the firm to stakeholders. Through the implementation of advanced financial modeling, the Managing Corporate Officer, Chief Financial Officer identifies opportunities for cost reduction and revenue growth. Somemiya secures the financial foundation necessary for the company to maintain its leadership position in the competitive global chemical industry.

    Taku Tanaka - Chief Financial Officer, Graphite Business Unit

    Taku Tanaka, the Chief Financial Officer, Graphite Business Unit at Resonac, manages the financial performance and operational budgeting for the specialized graphite division. Tanaka architects financial strategies that optimize the production costs of graphite materials used in mobility and electronics applications. By monitoring unit-level profitability, the Chief Financial Officer, Graphite Business Unit ensures that the division contributes effectively to the overall corporate bottom line. This role involves analyzing supply chain costs and market pricing to maintain competitive margins. Taku Tanaka drives the capital expenditure planning for the unit's manufacturing facilities. Tanaka provides detailed financial insights to the executive team to support strategic decisions regarding the graphite product line. Through rigorous cost control measures, the Chief Financial Officer, Graphite Business Unit improves the efficiency of the division's operations. Tanaka ensures that financial reporting for the unit adheres to corporate standards while supporting the specific growth objectives of the graphite business.

    Giwon Park - Chief Human Resources Officer

    Giwon Park, the Chief Human Resources Officer at Resonac, designs and executes the global talent strategy to support the company's diverse chemical operations. Park architects organizational development programs that foster innovation within the Semiconductor and Electronic Materials divisions. By implementing performance management systems, the Chief Human Resources Officer ensures that the workforce remains aligned with corporate goals. This role involves managing recruitment, retention, and leadership development initiatives across international regions. Giwon Park drives cultural transformation efforts to promote a collaborative and high-performance environment. Park oversees compensation and benefits structures to attract top-tier talent in the competitive chemical manufacturing sector. Through strategic workforce planning, the Chief Human Resources Officer addresses the evolving skill requirements of the business. Park facilitates communication between management and employees to maintain a productive workplace. By prioritizing professional growth, the Chief Human Resources Officer strengthens the internal capabilities required to sustain the company's market impact.

    Masato Fukushima - Corporate Officer, Chief Technology Officer

    Masato Fukushima, the Corporate Officer, Chief Technology Officer at Resonac, leads the research and development initiatives that define the company's technological edge. Fukushima architects the innovation pipeline for the Innovation Enabling Materials segment, focusing on next-generation chemical solutions. By collaborating with the Semiconductor and Electronic Materials teams, the Corporate Officer, Chief Technology Officer ensures that product development meets the rigorous demands of the global electronics market. This role involves evaluating emerging technologies and integrating them into the existing product portfolio. Masato Fukushima drives the patent strategy to protect the company's intellectual property. Fukushima manages the technical staff to accelerate the time-to-market for new chemical applications. Through continuous improvement of manufacturing processes, the Corporate Officer, Chief Technology Officer enhances product quality and operational efficiency. Fukushima aligns technical objectives with the broader business strategy to ensure long-term competitiveness. By fostering a culture of scientific excellence, the Corporate Officer, Chief Technology Officer maintains the company's status as an industry innovator.

    Shingo Maeda - Deputy Chief Human Resources Officer

    Shingo Maeda, the Deputy Chief Human Resources Officer at Resonac, supports the execution of global human capital initiatives and organizational policies. Maeda architects training programs that enhance the technical proficiency of employees within the Chemicals and Mobility segments. By assisting in the management of labor relations, the Deputy Chief Human Resources Officer ensures operational stability across international facilities. This role involves implementing diversity and inclusion strategies that reflect the company's global footprint. Shingo Maeda drives the adoption of digital HR tools to streamline administrative processes and improve employee engagement. Maeda collaborates with the Chief Human Resources Officer to align staffing levels with the company's strategic growth plans. Through the development of succession planning frameworks, the Deputy Chief Human Resources Officer prepares the organization for future leadership needs. Maeda monitors workplace safety and compliance standards to maintain a secure environment. By focusing on employee well-being, the Deputy Chief Human Resources Officer supports the overall productivity of the workforce.

    Atsushi Doi - Principal, Office of the CSO and Chief Revenue Officer

    Atsushi Doi, the Principal, Office of the CSO and Chief Revenue Officer at Resonac, directs the revenue generation strategies and strategic planning initiatives. Doi architects sales frameworks that expand the market reach of the Semiconductor and Electronic Materials segments. By analyzing customer demand and market trends, the Principal, Office of the CSO and Chief Revenue Officer identifies new revenue streams for the company. This role involves coordinating with the Chief Strategy Officer to align revenue goals with long-term corporate objectives. Atsushi Doi drives the implementation of customer-centric sales processes to improve retention and acquisition. Doi manages the sales pipeline to ensure consistent growth across international markets. Through the integration of data-driven insights, the Principal, Office of the CSO and Chief Revenue Officer optimizes pricing strategies for chemical products. Doi facilitates cross-functional collaboration to ensure that revenue targets are met. By focusing on market expansion, the Principal, Office of the CSO and Chief Revenue Officer secures the company's financial future.

    Norbert Gaar - Chief Operations Officer

    Norbert Gaar, the Chief Operations Officer at Resonac, oversees the global manufacturing and supply chain operations for the chemical business. Gaar architects the operational workflows that ensure the efficient production of materials for the Mobility and Chemicals segments. By optimizing plant performance, the Chief Operations Officer maintains high standards of quality and safety across all international manufacturing sites. This role involves managing the logistics network to ensure timely delivery of products to global customers. Norbert Gaar drives the adoption of lean manufacturing principles to reduce waste and improve operational margins. Gaar coordinates with the Chief Technology Officer to implement process improvements that enhance production capabilities. Through the management of operational resources, the Chief Operations Officer supports the company's ability to meet fluctuating market demand. Gaar ensures that all manufacturing activities comply with environmental and regulatory standards. By focusing on operational excellence, the Chief Operations Officer sustains the company's competitive advantage in the global chemical industry.

    Frequently Asked Questions Regarding Resonac Top Executives and Leadership Team

    Who leads Resonac?
    Resonac is led by Hidemitsu Arai (President & Chief Executive Officer (Asia)), along with executives such as Tomoe Kalnay (Chief Financial Officer & Treasurer) and Hideki Somemiya (Managing Corporate Officer, Chief Financial Officer).
    Who is part of Resonac’s executive team?
    The executive team of Resonac includes leaders such as Hidemitsu Arai (President & Chief Executive Officer (Asia)), Tomoe Kalnay (Chief Financial Officer & Treasurer), Hideki Somemiya (Managing Corporate Officer, Chief Financial Officer) and other senior executives.
    How many executives does Resonac have?
    Resonac has 9 executives leading key business areas.
    What roles are included in Resonac’s leadership team?
    The leadership team of Resonac includes roles such as President & Chief Executive Officer (Asia), Chief Financial Officer & Treasurer, Managing Corporate Officer, Chief Financial Officer, Chief Financial Officer, Graphite Business Unit, Chief Human Resources Officer.