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Improving Health Through Medical Physics

The Corporate Advisory Board (CAB) is comprised of individuals who represent an equal mix of imaging and radiotherapy industries – both large and small – and have maintained their AAPM Corporate Affiliate status in good standing over the past twelve months. CAB representatives are high-level decision makers within their corporations.

The corporate members of the AAPM Corporate Advisory Board express our support for the AAPM Statement on Racism, Injustice and Humanity issued June 2, 2020. Racism is a problem that disproportionately affects communities of color, and is deeply rooted in the socio-economic, healthcare, education and criminal justice systems that are supposed to treat our citizens equally. We stand with our AAPM colleagues to bring an end to longstanding discrimination and violence against Black Americans and all diverse members of society. To stand together, we must stand up for one another.

We believe that promoting diversity, inclusion and belonging can dismantle the policies that support racism and injustice in our society. As corporate members of the AAPM, we encourage all AAPM membership to commit to creating a safer, more just world for all of us.



11/01/2019 - 12/31/2022

Markus Yoon, MS

Senior Director of OEM and Strategic Accounts

Vice Chair


Rick J. LeBlanc, MBA

President - NELCO

Chair, Corporate Relations Committee

1/1/2021 - 12/31/2023

Norman Lee Brown Jr., HScD.



10/14/2019 - 12/31/2022

Carlos Castilleja

Vice President of Global Order Fulfillment and Senior Vice President of Order Fulfillment for North and Central America

IBA Dosimetry, The Americas

9/5/2019 - 12/31/2022

Bill Tom

Director of Sales

RaySearch Laboratories


Marc Mlyn




Daniel M. Ritt, MS

President & Chief Engineer

Siemens Healthcare


Christian Eusemann, PhD

U.S. Research Director

Varian Medical Systems


Corey E. Zankowski, PhD

Chief Technology Innovation Officer and SVP of Oncology Software Solutions


The CAB will focus on issues and initiatives of mutual interest through a synergistic relationship between AAPM and its Corporate Affiliates. It will foster long-term partnerships to advance the science, education and promote development and clinical implementation of safe and quality products used to diagnose and treat patients.


Twelve members.

Leadership Involvement

In addition to liaison with the Corporate Relations Committee, and representation by the Committee’s chair, members of AAPM’s Executive Committee will be ex-officio members and attend CAB meetings.

Election Process

Nominations for seats can come from any Corporate Affiliate company. To meet the objective of balance on the Board, there will be three distinct categories based on size (e.g., annual sales volume). Each category will have two seats. An annual election in the fall of each year will be held and each Corporate Affiliate company will be entitled to vote for up to six representatives in each category. The ballot will contain all nominees. Following the election, AAPM’s Corporate Relations Committee will submit the results to the AAPM Board of Directors for final approval. Each corporation has one vote, e.g., management must consolidate their opinions and have one individual cast one vote for the corporation.

In the event that the election results do not meet the stated criteria, the Corporate Relations Committee reserves the right to recommend additional seats (not to exceed three) to achieve the proper balance and representation. Final approval of all seats rests with the AAPM Board of Directors.


Candidates for CAB seats must meet the following criteria:

  • The company must hold AAPM Corporate Affiliate status
  • Prior involvement in AAPM meetings
  • A willingness to provide advice and assistance to AAPM on current and planned programs, projects and needs
  • Top level management representation (ability to make corporate decisions) for their company
  • Past financial support of AAPM or potential for future support
  • A willingness to assume expenses associated with involvement on the Board
  • Commitment to serve
  • Three face-to-face meetings each year (Spring Clinical Meeting, Annual Meeting and RSNA); bi-monthly conference calls
  • There will be no fee for a Board seat aside from annual Corporate Affiliate dues

Conduct of Business

The CAB is, by its nature, a smaller representative group of all Corporate Affiliate members of the AAPM. Its membership shall have a proportional mix of both imaging and radiotherapy equipment vendors, with seats equally balanced between large and small corporations, representative of a broad cross-section of the industry, both in scope and products. Seats on the Board should be held by high-level, decision-makers within each corporation.


The CAB will develop meaningful opportunities for providing and sharing advice and input on areas of mutual concern in medical physics technology and products.

The CAB will have greater involvement with, and support from, the corporate sector in AAPM activities.


Representative members of the CAB will have their photographs, a brief biography and company logo posted on AAPM’s website, in addition to a hyperlink to the company’s website.


Members shall be appointed for three-year terms, renewable once and subject to annual reappointment.