Board of Directors

William J. Colgan

Chair and Treasurer

William J. “Bill” Colgan is a recognized industry leader with over 30 years of extensive background in healthcare, real estate, and finance matters. As Managing Partner of CHA Partners, LLC, Bill is responsible for business development, strategic planning and financial operations. Bill has directly overseen the expansion of CHA Partners’ portfolio, which includes more than three million square feet of properties owned and/or under development, the majority of which are healthcare focused. Among Bill’s many achievements are the acquisition and repurposing of five (5) acute- care hospitals, the development of numerous ambulatory care centers, ambulatory surgical centers, and assisted living and long- term care facilities. Bill was selected by New Jersey Governors Phil Murphy and Mikie Sherrill to serve as a key part of their Healthcare Transition Team and was also was appointed by Governor Murphy to the Board of the Advisory Graduate Medical Council of New Jersey.

Margaret R. Peterson, PhD

Vice-Chair

Dr. Margaret Peterson is a result-oriented executive with extensive leadership experience in strategic planning, fiscal management, physician relations, clinical program development, graduate medical education, physician recruitment, systems redesign, quality performance initiatives, construction & remodel, regulatory compliance, population health, government relations, fund raising, community relations, community benefits, medical group management and academics. Through her many years working in the healthcare field, Dr. Peterson has achieved several significant accomplishments due to her initiative, decisiveness, innovation, perseverance, creative problem solving and relationship building. These accomplishments include several well-known and respected awards and recognitions in healthcare as well as serving as a board member for numerous professional and community service associations.

Joseph P. Baumann, Jr.

Joseph Baumann is a recognized finance, redevelopment, and development attorney within the State of New Jersey. With over 35 years of experience in all aspects of infrastructure, development, and public sector law, Joseph’s expertise includes, but is not limited to, public-private partnerships and complex development projects including finance, government incentives, land use, real estate, and procurement. Joseph has developed a reputation in New Jersey for guiding clients through the challenges associated with the undertaking of transformative projects complicated by the presence of unaligned stakeholders, deficient infrastructure, environmental difficulties, and multi-layered capital stacks. Joseph is currently Chairman of McManimon, Scotland & Baumann, LLC.

Dr. Charles W. Diggiss, MBBS, FRCS, MMM, FCiArb, CDir, OBE

Dr. Charles W. Diggiss is the President and Chief Executive Officer of Doctors Hospital Health System (DHHS) and Chairman of The MedNet Group of Companies. With a distinguished career spanning over four decades, Dr. Diggiss is a renowned surgeon, healthcare executive, and philanthropist. His leadership has significantly shaped the healthcare landscape in The Bahamas, with contributions extending into business, education, and community development.

Born on July 11, 1955, in Nassau, Bahamas, Dr. Diggiss was raised on Cambridge Street, “Over-the-Hill,” and educated at Queen’s College before earning his medical degree from the University of the West Indies. He completed advanced surgical training in Glasgow, Scotland, where he became a Fellow of the Royal College of Physicians and Surgeons (FRCS).

Dr. Diggiss began his career as a surgeon and Director of the Accident & Emergency Department at Princess Margaret Hospital, moving to private practice and Doctors Hospital in 1989. He later advanced laparoscopic surgery in The Bahamas, introducing the Lapband and Sleeve Gastrectomy procedures. After decades of surgical practice, he retired from surgery in 2020.

Throughout his tenure at Doctors Hospital, Dr. Diggiss has held numerous leadership roles, including Vice President of Medical Affairs, Chief Medical Officer, and currently, President & CEO. He is currently the largest single shareholder in Doctors Hospital Health System. Under his guidance, Doctors Hospital achieved Joint Commission International Accreditation and implemented its Electronic Health Record system.

In addition to his healthcare leadership, Dr. Diggiss is Chairman of The MedNet Group, which holds significant real estate and equity interests. His philanthropic efforts focus on education and professional development for Bahamian youth and healthcare professionals. He is the founder of several impactful initiatives, including the GLOW (Grow. Learn. Outreach. Wow!) Initiative, GLOW STEP Program, and GLOW Bridge to the Future Program.
Dr. Diggiss holds a Master’s Degree in Medical Management from the University of Southern California and is a Certified International Arbitrator and Certified Director. His service and humanitarian contributions have been recognized with numerous honors, including the Officer of the Order of the British Empire (OBE) and two Paul Harris Fellowships.

In his personal life, Dr. Diggiss enjoys reading non-fiction and spending quality time with his wife, Ciara, their children, and close friends. His personal motto reflects his dynamic leadership: “Pursue all that is possible: execute relentlessly.” and “Opportunity advantages those who are best prepared, best planned, best positioned.”

Lawrence DuBuske, MD, FAAAAI, FACAAI, FACP, FACCP, FACR, FAACA

Professor Lawrence DuBuske serves as an Affiliate Physician at George Washington University Hospital, Washington, DC, USA, joining the Division of Allergy and Immunology, Department of Internal Medicine at George Washington University Medical Faculty Associates in Washington, DC, in December 2010, where he has served as Clinical Professor of Medicine at The George Washington University School of Medicine and Health Sciences commencing in 2010. He serves as Director of the Immunology Research Institute of New England, Gardner, Massachusetts since 1989 and its founding. He is a Consulting Physician at U. Mass Memorial HealthAlliance Hospital, Leominster, Massachusetts, Past Faculty Member at Harvard Medical School, and a Past Consulting Physician at Brigham and Women’s Hospital, Boston, MA (1981-2010) where he was the Allergy Fellowship Training Program Director in the mid 1990 serving with Professors K. Frank Austen and Albert Sheffer. He graduated from Northwestern University School of Medicine, Chicago, Illinois in 1978 with Distinction and as President of the Alpha Omega Alpha medical honor society chapter there. His education in allergy began in 1976 under Professor Roy Patterson, serving in the allergy field now for 50 years.

He is the Past President of INTERASMA Global Asthma Association (2017-2018) and Past President, current Treasurer of the American Association of Certified Allergists and Distinguished Fellow, Past Regent, Past Speaker of the House of Delegates, American College of Allergy, Asthma and Immunology and Fellow, past Chair of the Practice Standards Council, American Academy of Allergy, Asthma and Immunology. He is a Fellow of the American College of Chest Physicians; the American College of Rheumatology; and the American College of Physicians. He is a Platinum Member of the European Academy of Allergy and Clinical Immunology.

Dr. DuBuske is listed on the Publons Web of Science under Research Investigator ID AAV 3402-2020, which notes his 691 publications, 1351 citations, and Hirsch Index of 20. He has been an investigator in over 90 clinical trials and has provided over 3,000 lectures during the past 40 years, including over 1000 invited lectures in continuing medical education accredited programs in the United States and abroad and over 2000 educational lectures related to allergy and asthma therapeutics in non-CME programs throughout the United States.

He also is Director of Immunology Research Institute of New England – IRINE- a non profit foundation he founded in 1989 which has developed a consortium of over 30 research sites in Ukraine, Belarus, Kazakhstan, Russia, Lithuania, Bulgaria, Poland, Hungary, Slovenia and Czech Republic. He has been given a variety of Awards including 2 citations from the Polish Allergy Society; and awards from the Danylo Halytsky Lviv Medical University, Lviv, Ukraine including the Honorary Medal for Professionalism and Integrity from LOKDL, Lviv, Ukraine; the I.P. Lerner medal for contribution to the development allergology from the Ukrainian Society of Allergy and Immunology (UTIAI) ; and Honorary Medal on the 125 Anniversary of the Lviv Scientific Shevchenko Society, Lviv, Ukraine; and has been awarded Honorary Professorships including at Bogomolets Medical University in Kyiv, Ukraine; at the Crimean State Medical University in Simferopol, Crimea; at the Belarussian Research Institute of Epidemiology and Microbiology, Minsk, Belarus; and at the Russian Federal Institute of Immunology, Moscow, Russia. He was the sole US sponsor for 2 USAID grants to the Russian Federal Institute of Immunology, 1990s for study of splice variant Interleukin 4. He was given an official letter of gratitude for IRINE activity in Eastern Europe from then US President Bill Clinton and an award for IRINE activity in Massachusetts from then Governor Michael Dukakis and State Representative Chet Suhoski.

He has served as a consultant to numerous pharmaceutical companies including Novartis (Rapsido-remibrutinib and Xolair-omalizumab) and Genentech (Xolair); GSK (Trelegy; Nucala-mepolizumab; and Depemokimab-ulaa); Astra Zeneca (Fasenra-benralizumab; Tezspire-tezepelumab-ekko, Symbicort and Air Supra) Sanofi and Regeneron (Dupixent-dupilumab); Amgen (Tezspire) and ALK (SLIT- grass; ragweed and dust mite). Currently he is lead US Consultant for Allergy Therapeutics a British company in Worthing, England in the development of Modified Allergen MPL Immune Adjuvanted Immunotherapy for grass pollen and ragweed pollen; and Virus Like Particle (VLP) Peanut desensitization Immunotherapy.

Dr. DuBuske is an internationally acclaimed expert speaker on topics including allergic rhinitis, antihistamines, asthma, allergic diagnostics, allergen immunotherapy, latex allergy, and new therapies including biologics in asthma and chronic rhinosinusitis/nasal polyposis, in Eosinophilic Esophagitis, in Chronic Spontaneous Urticaria, in Atopic Dermatitis and in COPD He is an expert on anti-eosinophil and anti-cytokine therapies, and immunopathology of allergic and Type 2 inflammatory disorders.

Willie A. M. Moss

A native of Nassau, Bahamas, Mrs. Willie Moss (nee Musgrove) began her vocational journey as an Articled Clerk in the Attorney General’s Chambers in 1972 and was admitted to The Bahamas Bar in July 1977. Mrs. Moss served as Assistant Counsel in the Office of The Attorney General and Department of Legal Affairs until June 1980 when she relocated to Freeport, Grand Bahama, and joined The Grand Bahama Port Authority, Limited & Group Companies (“the GBPA”) as Legal Counsel.

In 1982, Mrs. Moss was appointed General Counsel of the GBPA. In 1998, she became the first female to be appointed Deputy Chairman of the GBPA and in 2003, she became the first female President of the GBPA.

In 2007, Mrs. Moss joined the partnership of GrahamThompson, one of the oldest and highly acclaimed premier law firms of The Bahamas, and enjoys a thriving practice in the firm’s corporate, commercial and real estate areas of law. She has extensive experience in acquisitions and mergers, investment, regulatory, and environmental law, and possesses an unrivaled depth of knowledge of the industrial and commercial sectors in Grand Bahama.

A senior member of the Bar, Mrs. Moss has served in numerous capacities, including, Member of the Bar Council, Member of The Disciplinary Tribunal of The Bahamas Bar Association, and President of The Freeport Law Society. In addition, Mrs Moss has held several pivotal civic roles and has served as Deputy Chairman of Bahamas Agricultural and Industrial Corporation (BAIC), Deputy Chairman of The Bahamas Mortgage Corporation, Chairman of The Grand Bahama Island Tourism Promotion Board, Member of The Bahamas Constitutional Commission, Member of the Board of the Deposit Insurance Corporation of The Bahamas, and Honorary Chairperson for The Pink Run (formerly the Susan G. Komen Bahamas Race for the Cure9 from 2012 to 2024. She is a former President of the Pilot Club of Freeport and is a Charter Member of the Pilot Club of Lucaya in the Bahamas District of Pilot International.

Mrs. Moss presently holds directorships on the Boards of CIBC Caribbean Bank (Bahamas) Limited, CIBC Caribbean Trust Company (Bahamas) Limited, and Colina Insurance Company Limited.

Daniel Nathan, MSW

Dan Nathan is a respected organizational specialist and executive coach, with more than 25 years of experience in leadership roles in both the public and private sectors, nationally and internationally. He consults with healthcare institutions; schools; and small, mid-sized, and Fortune 500 companies for their organizational needs, executive coaching, team building, communication techniques, and conflict resolution. He has expertise in organizational management processes, including development of corporate and departmental strategic plans, restructuring and consolidation/streamlining of services, and improved coordination of programs for healthcare systems and major corporate settings. Dan oversaw the healthcare system at a major university medical center, where he developed processes and strategies to create an effective and coordinated health care system, facilitated open communication with the Medical Center, College of Medicine, and other health science colleges. Additionally, Dan served as Director of Human Resources for two major organizations and is a trained mediator for union and management/staff-level negotiations.

Thomas C. Shepherd, DHA, LFACHE

Dr. Thomas Shepherd has served as the CEO of five hospitals in the United States and is a past president of several universities, including Ross University School of Medicine (RUSM) and Bastyr University, a Kenmore, Washington-based university with multiple offerings in healthcare education. In these roles, he led important initiatives including the recruitment of highly qualified faculty, installing cutting-edge technology, advancing accreditation, and making significant quality enhancements to improve student outcomes. Thomas has also served in senior management roles of a variety of hospitals and healthcare facilities.