Leadership Team

Samuel Cho

Co-Founder, CTO, RFHIC HQ

Samuel Cho

Co-Founder, CTO, RFHIC HQ

Dr. Samuel Cho is the co-founder and chief technology officer of RFHIC Corporation, responsible for leading RFHIC's R&D department for wireless infrastructure, defense & aerospace, and RF energy applications.

Founded Radio Frequency Hybrid Integrated Circuits (RFHIC) in August 1999, starting with an incurable need for cost-effective GaAs components for satellite applications within South Korea. As Co-Founder and CTO he led RFHIC's pioneering movement towards gallium nitride (GaN) on silicon carbide (SiC) technology for commercial telecommunication, defense & aerospace, and ISM applications.

Cho has over 40 years of RF & Microwave expertise in gallium nitride (GaN) technology. As Co-founder and Chief Technology Officer of RFHIC, Dr. Cho focuses on pioneering breakthrough semiconductor technology for next-generation commercial RF & Microwave applications.

He holds a bachelor's degree in electrical engineering from Kwangwoon University, a master's degree, and Ph.D degree in electrical engineering from Yonsei University.

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David Cho

Co-Founder, CEO, RFHIC HQ

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David Cho

Co-Founder, CEO, RFHIC HQ

David Cho is the co-founder and chief executive officer of RFHIC Corporation, responsible for leading the world's first and only one-stop GaN solution company of 300+ employees and $100 million in annual sales.

He oversees the company's three business units, as well as its functions for finance, operations, quality, supply chain, human resources, engineering, and manufacturing. Cho brings a broad range of experience in business management, strategy, and finance. During his 20+ years, he led RFHIC's IPO for the Korean stock exchange (KOSDAQ) in 2017, as well as the company's acquisition of RFMTL in 2019.

Cho holds a bachelor's degree in finance from Suny Polytechnic Institute.

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Byunghyun Kwon

Head of Defense & Aerospace, RFHIC HQ

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Byunghyun Kwon

Head of Defense & Aerospace, RFHIC HQ

Byunghyun Kwon serves as President and Head of the Defense & Aerospace Division at RFHIC Corporation, overseeing the company’s defense and aerospace business and leading its expansion in global markets. In this role, he drives strategic initiatives to enhance RFHIC’s competitiveness in the global defense and aerospace industry by leveraging advanced RF technologies and system-level solutions.

Mr. Kwon brings broad experience across defense business operations, strategy, manufacturing, procurement, and global business management. Prior to joining RFHIC, he held a number of senior leadership positions at LIG Nex1, where he led strategic planning, U.S. operations, procurement, and manufacturing organizations. He later served as Head of the C4ISTAR Business Division, overseeing large-scale defense programs in command, control, communications, intelligence, surveillance, and reconnaissance.

Since joining RFHIC, Mr. Kwon has focused on expanding the company’s defense portfolio beyond its existing business while strengthening collaboration with key industry partners. Under his leadership, RFHIC continues to create new growth opportunities in the global defense and aerospace market by combining high-performance RF technologies with innovative system solutions.

Mr. Kwon holds a bachelor’s degree in Mechanical Engineering from the University of Ulsan and a master’s degree in Mechanical Engineering from Yonsei University.

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Stella Bae

CEO, RFHIC US Corporation

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Stella Bae

CEO, RFHIC US Corporation

Stella Bae is Chief Executive Officer of RFHIC US Corporation, an independent subsidiary of RFHIC Corporation. RFHIC US was established to support ITAR-related customers and applications, as well as a wide range of other commercial and defense applications. In this role, she oversees the overall operations of the U.S. organization.

Ms. Bae brings over 30 years of experience and a broad range of expertise in business management, strategy, supply chain, and administration. From the early stages of the company’s growth in 1999, she worked in the United States as a liaison officer, supporting coordination between RFHIC headquarters and U.S.-based customers.

In 2007, Ms. Bae established RFHIC US in Cary, North Carolina. In 2011, she led the company’s facility expansion in Morrisville, North Carolina, and formally incorporated RFHIC US Corporation at that location.

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Sam Kim

GM/ VP , RFHIC US Corporation

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Sam Kim

GM/ VP , RFHIC US Corporation

Sam Kim is the general manager and vice president of RFHIC US Corporation, an independent subsidiary of RFHIC Corporation. RFHIC US was founded to support ITAR-related customers/applications and various other applications. He oversees the company’s three business units, as well as its function for technology, engineering, global sales, and operations.

Sam brings a broad range of experience in business management, sales, strategy, and engineering. Since joining RFHIC in 2009, Sam has played a pivotal role in expanding the company’s defense & aerospace business which strengthened RFHIC US’s position within the global cellular and radar markets. Under his leadership, RFHIC US successfully incorporated GaN RF & Microwave solutions for various applications in defense, aerospace, wireless infrastructure, and more. He treasures the trust he gains from his customers and partners.

Before joining RFHIC, he held key managerial and technical positions at Alcatel-Lucent from 2000 to 2007 respectively.

Sam holds a mechanical engineering degree from Penn State University, a master's degree (Sponsored by Lucent) in technical management/systems engineering from Johns Hopkins University, and an MBA from Duke University.

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Tom Kim

CFO/ Head of Corporate Management, RFHIC HQ

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Tom Kim

CFO/ Head of Corporate Management, RFHIC HQ

Tom Kim is the chief financial officer of RFHIC Corporation. He oversees the company's financial reporting and controls, planning and analysis, investor relations, internal audit, tax, and administrative personnel. He also oversees all financial reporting for RFHIC's subsidiary RFMTL.

Kim joined RFHIC in 2006 and served as the financial manager, finance controller, and financial administrator before being appointed CFO in 2017. He also played a key role in the company's IPO in 2017, as well as the company's acquisition of RFMTL in 2019.

He holds a bachelor's degree in economics from Sogang University in South Korea.

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Sungyong Park

Head of Manufacturing & Quality, RFHIC HQ

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Sungyong Park

Head of Manufacturing & Quality, RFHIC HQ

Mr. Park serves as Head of Manufacturing & Quality at RFHIC, where he is responsible for strengthening the company’s manufacturing and quality capabilities in response to the diversification of RFHIC’s product portfolio. In this role, he focuses on enhancing system- and module-level manufacturing and testing competencies to support scalable and reliable product delivery.

Prior to joining RFHIC, he spent nearly 29 years at Samsung Electronics, where he worked in communication system hardware development and system architecture design. He played a key role in system architecture development for 3G and 4G base stations and later led 5G base station product development organizations, contributing to the industry’s first development of 28 GHz base station products. He also headed base station modem chip development teams, successfully leading the commercialization of 5G communication chips for base station applications. Since 2021, he led development organizations responsible for the commercialization of 4G and 5G Remote Radio Head (RRH) products across multiple frequency bands.

He holds bachelor’s and master’s degrees in Electronic Engineering from Seoul National University and received a Ph.D. in Electrical and Electronic Engineering from Seoul National University.

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Dongsub Park

Head of RF Energy System Business, RFHIC HQ

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Dongsub Park

Head of RF Energy System Business, RFHIC HQ

Dong Sub Park is Head of RF Energy System Business at RFHIC Corporation, where he oversees the company’s RF energy business, including its technology and engineering functions. In this role, Mr. Park is responsible for developing next-generation high-power microwave generator products for industrial, scientific, and medical (ISM) applications.

Mr. Park joined RFHIC in 1999 as an R&D engineer and served in multiple engineering positions before being appointed General Manager of Manufacturing in 2011. In 2021, he was appointed General Manager of Engineering for the RF Energy Division. Mr. Park brings a broad range of expertise in semiconductor manufacturing, R&D, and strategy. With over 27 years of experience, he drives the growth of RFHIC’s RF energy business by developing innovative GaN-based RF and microwave solutions.

Mr. Park holds a bachelor’s degree in Mechatronic Engineering from Daedeok University in South Korea.

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Hyunchul Kang

Head of Domestic Defense Business, RFHIC HQ

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Hyunchul Kang

Head of Domestic Defense Business, RFHIC HQ

Hyunchul Kang is Head of Domestic Defense Business at RFHIC Corporation, where he oversees the company’s domestic defense business. In this role, Mr. Kang has been responsible for driving the growth of RFHIC’s domestic Radar, Milcom, and Electronic Warfare sectors through the development of diverse and innovative GaN solutions.

Mr. Kang joined RFHIC Corporation in 2000 as an R&D engineer and has since served in multiple leadership positions within the Engineering department. In 2017, he was appointed Director of Engineering and Sales, where he led the division’s expansion across the Radar, Milcom, and Electronic Warfare markets.

Mr. Kang brings broad expertise and experience in business management, engineering, and strategy.

Mr. Kang holds a bachelor’s degree in Electrical Engineering from Kyonggi University in South Korea and is currently pursuing a master’s degree in Defense Technology Management at Kwangwoon University.

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Junsik Kwak

Head of Advanced GaN Solution R&D, RFHIC HQ

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Junsik Kwak

Head of Advanced GaN Solution R&D, RFHIC HQ

Dr. June Sik Kwak is the Head of Advanced GaN R&D at RFHIC Corporation. He oversees the development of RF devices and fabrication processes.

Dr. Kwak brings a broad range of experience in semiconductor devices and materials, playing a vital role in developing the company’s next-generation products like GaN on Diamond transistors. Since joining RFHIC in 2021, he has led the development of cutting-edge RF gallium nitride (GaN) devices and fabrication processes, as well as the development and evaluation process of the foundry facility.

Before RFHIC, he focused on disruptive technology development and management for the AlGaN-based DUV emitter as R&D director at Seoul Viosys Inc. from 2019 to 2021.

He was the principal researcher and group leader for the development of high-power GaN devices at Seoul Semiconductor Inc. from 2011 to 2019.

Dr. Kwak received his Ph.D. degree in solid-state and semiconductors physics from Hanyang University in South Korea 2010.

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Sangmin Nam

Head of Technology Innovation, RFHIC HQ

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Sangmin Nam

Head of Technology Innovation, RFHIC HQ

Sangmin Nam serves as Head of Technology Innovation at RFHIC. In this role, he strengthens the company’s R&D capabilities by strategically exploring and securing key technologies across RFHIC’s business sectors. He plays an important role in advancing technological innovation and enhancing RFHIC’s competitiveness in the global market.

Prior to joining RFHIC, Mr. Nam led RF and millimeter-wave (MMW) communication system design at the Samsung Advanced Institute of Technology and contributed to MMIC development at Analog Devices in the United States. His extensive experience in high-frequency communication technologies continues to support RFHIC’s ongoing technology advancement.

Mr. Nam holds a master’s degree in Communication Engineering from Chung-Ang University in South Korea.

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Inyong Song

Head of Customer Satisfaction, RFHIC HQ

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Inyong Song

Head of Customer Satisfaction, RFHIC HQ

In Yong Song is Head of Customer Satisfaction at RFHIC Corporation, where he oversees the company’s manufacturing division for PA modules, T/R modules, and microwave generator systems serving both domestic and overseas markets.

Mr. Song joined RFHIC in 2000 as an R&D engineer focused on localized RF components for 3G mobile communications. As Head of R&D for the Telecommunications Division, he led the development and commercialization of gallium nitride (GaN) transistors and power amplifier modules for Samsung’s 3G and 4G markets. He also played a vital role in registering RFHIC as a certified vendor for Samsung Electronics.

Mr. Song brings a broad range of expertise and know-how in RF and microwave components, contributing to the strategic direction of the company’s wireless infrastructure business through diverse and innovative solutions.

Mr. Song holds a bachelor’s degree in Electronic Engineering from Kyonggi University, which he received in 1998.

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Changhyun Kang

Head of Defense R&D, RFHIC HQ

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Changhyun Kang

Head of Defense R&D, RFHIC HQ

Changhyun Kang is Head of Defense R&D at RFHIC, where he leads research and development activities for defense applications. In this role, Mr. Kang oversees the development of next-generation GaN-based RF solutions for radar, electronic warfare, and military communication (Milcom) systems, supporting a wide range of defense platforms.

Mr. Kang joined RFHIC in 2004 as an RF module R&D engineer and has accumulated over 20 years of experience in RF and microwave research and development. Throughout his career, he has played a key role in developing GaN T/R modules, GaN SSPA, and GaN transmitter solutions for defense applications, including radar, electronic warfare, and military communication systems.

In 2023, Mr. Kang was appointed Director of the Defense Development Division, where he continues to drive innovation in high-power GaN RF technologies to meet the evolving requirements of modern defense systems.

Mr. Kang holds a bachelor’s degree in Electronic Engineering from Soonchunhyang University in South Korea.

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Wireless Infrastructure

RF Energy

Defense & Aerospace

Company

Samuel Cho

David Cho

Byunghyun Kwon

Stella Bae

Sam Kim

Tom Kim

Sungyong Park

Dongsub Park

Hyunchul Kang

Junsik Kwak

Sangmin Nam

Inyong Song

Changhyun Kang