Executive Team

Hisashi Tachizaki

President and CEO, Canon Medical Systems USA

Hisashi Tachizaki is President and CEO of Canon Medical Systems USA, leading the company’s efforts to deliver innovative medical imaging solutions that improve patient care. With over 30 years of experience, Tachizaki has held key roles in CT engineering, research, marketing and within our business units, driving advancements in medical technology. He began his career at Toshiba Corporation, developing continuous rotating gantries for CT systems. He later transitioned to Toshiba America Medical Systems, where he focused on CT business marketing and collaborated with leading healthcare institutions.

Tachizaki returned to Japan to lead global CT development projects and served as General Manager of the R&D Center and CT Business Unit. In 2022, he was appointed Senior Vice President and Chief Marketing Executive for Canon Medical Systems Corporation. In 2023, he was named President and CEO of Canon Healthcare USA, Inc., and in 2025, he assumed his current role as President and CEO of Canon Medical Systems USA. Tachizaki holds a master’s degree in Mechanical Engineering and is committed to advancing healthcare through innovation and strategic customer partnerships.

Maryanne McHugh

Senior Vice President, Office of the President

As Senior Vice President, Office of the President, Maryanne McHugh provides enterprise-level leadership to strengthen strategic decision-making, execution, and cross-functional alignment across Canon Medical Systems USA. She leads the Office of the President as a central enterprise function, advancing the company’s strategy framework, driving data-informed insights, and ensuring disciplined execution of key initiatives in coordination with Canon Medical Group. She serves as a trusted advisor to the President and executive leadership team.

McHugh brings extensive experience across clinical practice and global commercial leadership in medical imaging. She began her career as a Nuclear Medicine Technologist and Sonographer before joining Toshiba Australia/New Zealand, where she held roles in sales, clinical applications, and business unit leadership across CT, MRI, Ultrasound, Vascular, and X-ray. She later served as National Marketing Manager, overseeing all modality business units and marketing strategy.

Following the formation of Toshiba Healthcare in Japan in 2014, McHugh worked as Strategic Advisor to the President, supporting business development across a diverse portfolio of healthcare solutions. After Canon’s acquisition, she returned in senior strategic roles at Canon Medical Systems Corporation, contributing across marketing, business development, strategic planning, and executive communications. She was appointed Vice President of Canon Medical Systems Corporation and Chief Global Marketing Executive in 2024. She also played a key role in establishing Canon Healthcare Americas in 2022, where she now also serves as Vice President of Business Strategy.

Kathy Canum

Vice President, Chief Administrative Officer

Kathy Canum is a seasoned executive with over 13 years of experience at Canon Financial Services, Inc. (CFS). In her role as Vice President and Chief Administrative Officer, she oversees Finance, Accounting, Information Technology, Contracts & Operations Support, and Facilities Management. She manages these critical functions to advance the company's strategic objectives and support our core business goals.

Before her current role, she served as Senior Vice President of Administration. During her tenure, her extensive oversight has included critical functions such as asset management, general affairs, and project management. Canum also has extensive experience in executive leadership, with six-plus years in such roles at CFS. This leadership style is marked by strategic vision and the ability to foster a culture of collaboration, innovation, and excellence.

Canum holds an MBA from the University of Pennsylvania's Wharton School, a C.P.A. certification, and is actively involved in the Equipment Leasing and Finance Association (ELFA) as a director on the board.

Err Gozun

Chief Human Resources Officer

As vice president of human resources, Gozun is responsible for leading CMSU's HR strategy and programs. Prior to joining Canon Medical in July 2021, Gozun held various positions, including sales, HR, EPMO, vendor management, procurement, and corporate strategy in retail, banking, finance, and pharmaceutical industries. Gozun has a master's degree in human resources from the University of Southern California.

Nate Aushwitz

Vice President, Legal and Compliance

As Vice President of Legal and Compliance, Nate Aushwitz is responsible for leading all legal, regulatory, and compliance functions for Canon Medical Systems USA. Aushwitz oversees risk management, employment law and leads the negotiation of contracts to safeguard the company's legal and ethical integrity. With over 15 years of experience as counsel for top healthcare organizations, including GE Healthcare, his career is distinguished by deep expertise in regulatory affairs, risk management, and complex contractual negotiations. Aushwitz holds a BS and JD from Vanderbilt University Law School and an MBA from the University of Chicago Booth School of Business.

Tomokazu Harada

Vice President, Full Line Business Unit

As Vice President of the Full Line Business Unit, Tomokazu Harada is responsible for leading the commercial strategy for Canon Medical's CT, MR, and Molecular Imaging (MI) modalities in the U.S. market. Additionally, Harada's role spans across Canon Medical Systems USA (CMSU), Canon Healthcare Americas (CHCU), and Canon Medical Systems Corporation (CMSC) to introduce next-generation innovations. Before assuming this role, Harada served as Senior Manager of CT Marketing and Promotion at Canon Medical Systems Corporation in Japan. Harada led product planning for Canon's Digital PET-CT system and innovative, user-friendly CT systems. With over 30 years of experience at Toshiba/Canon Medical Systems, his career includes key leadership roles in CT development, product management, and marketing.

Ryohei Sumida

Vice President, Business Operations

As Vice President, Business Operations, Sumida brings over two decades of experience in global business strategy, logistics, and operational leadership. Previously, Sumida held key roles at Canon Medical Systems Corporation in Japan, including senior specialist in the Global Business Operation Group, where he managed global processes and strategic initiatives. His career highlights include leading international sales across Asia and the Middle East, and serving as logistics manager for Canon Medical Systems Europe. With a strong background in driving operational efficiency and international business growth, he is well-equipped to oversee Canon Medical USA’s business operations.

Thomas Freund

Vice President, Service Operations

As vice president of service operations, Freund is responsible for leading Canon's U.S. service organization, including all field operations, technical operations, the solutions center, the service training academy, and clinical applications. Formerly Regional Vice President of Service – North, Freund's eight years with Canon Medical were preceded by 29 years of industry experience with Oxford Instruments plc, where responsibilities included manufacturing, training, and account management roles. This experience concluded as general manager/director of service operations for a business that addressed international healthcare industry needs for high-technology equipment, notably MRI and CT scanners.

John Serovich

Vice President, Ultrasound/X-Ray Business Unit

John Serovich joined Canon Medical in 2013 and is responsible for leading Canon Medical's expansive ultrasound and X-ray business unit, including sales, marketing, and applications. Prior to this position, Serovich held the position of vice president of full line sales, leading national vertical sales teams for all full line segments. Additional roles in the Canon Medical sales organization include national director of CT sales, Gulf South Zone Vice President, and CT National Sales Vice President. Serovich began a career in medical imaging over 25 years ago. Before Canon, roles included senior-level sales and marketing management positions at Philips Healthcare and Siemens Medical Solutions.

Dan Zonkle

Vice President, Sales

Zonkle is an accomplished national sales leader with over 30 years of experience in high-performance healthcare organizations. Zonkle joined Canon in 2016 and is responsible for national sales, revenue growth, sales support, alternate channel business, and key opinion leader engagements in the national market. Prior to Canon, Zonkle was regional VP of sales at Philips Healthcare and led sales operations with cross-functional business units to develop and execute sales strategies on diagnostic imaging, connected care, and IT solutions. During tenure at Canon Medical, Zonkle played a vital role in developing strategic sales strategy and successfully led the collaborative sales team to achieve company targets.

David Hashimoto

Vice President, Marketing and Sales Strategy

As Vice President of Marketing and Sales Strategy, Hashimoto is responsible for leading Canon Medical Systems USA's corporate go-to-market strategy across all modalities and the company's digital customer engagement models. Prior to this position, Hashimoto served as senior director of full line imaging business units and solutions marketing, leading Canon Medical's digital marketing transformation and increasing overall market share. Before joining Canon Medical Systems USA, Hashimoto served as USCAN Imaging chief marketing officer and commercial GM for ASEAN at GE Medical Systems. With over 25 years of international industry experience in medical imaging product management, business management, and marketing leadership, Hashimoto has a successful track record in upstream and downstream marketing.