Mr Chadwan Al Yaghchi is a consultant laryngologist at the National Centre for Airway Reconstruction, Imperial College Healthcare, London. He manages the full spectrum of laryngeal disorders with specialist interest in airway stenosis and complex dysphagia. Mr Al Yaghchi holds a PhD in Molecular Oncology from Queen Mary’s University of London studying oncolytic viruses in head and neck cancers. In addition, he has an active clinical research program in voice, airway and swallowing disorders.

Mr Al Yaghchi is a founding member of the British Laryngological Association and the president-elect. He is the deputy general secretary of the Eropean Laryngological Society and Board member of the International Association of Transvoice Surgeon. He is a board member of the UK Swallowing Research Group and former Vice president of the Royal Society of Medicine, Section of Laryngology and Rhinology.

Dr. Katherine Yung is a laryngologist and Director of Laryngology at Sutter California Voice and Swallowing in San Francisco. With a lifelong background in music, she was drawn to laryngology’s intersection of artistry and medicine. She previously spent a decade on the faculty at the University of California, San Francisco, where she served as Acting Director of the UCSF Voice and Swallowing Center, was promoted to Associate Professor of Clinical Otolaryngology, and received the Sooy Award for Clinical Excellence. She later founded San Francisco Voice & Swallowing, nationally recognized for professional voice and gender-affirming voice care.

Dr. Yung consults for the Berkeley Repertory Theatre, Broadway SF, and San Francisco Opera and is a member of the International Association of TransVoice Surgeons. 

Since 1999, my medical and surgical practice has been limited to voice care. I maintain an

informational web site on voice disorders - voicedoctor.net, preceptor medical students in their

early years at Oregon Health Sciences University, offer an international fellowship in laryngology as

well as short observerships to physicians, speech therapists, voice teachers and interested students.

I produce “voxdoc, the voicedoctor” on YouTube, including Laryngology 101, a series of learning

videos. I published “Why is there a frog in my throat? A guide to hoarseness.” I frequently lecture

internationally on laryngology and phonosurgery. I remain surprised at how much there is still to learn

about the larynx.

Dr. Elad Azizli is an ENT (Ear, Nose, and Throat) specialist based in Istanbul, Türkiye, where he runs his private practice. He graduated from medical school and subsequently completed his residency in Otorhinolaryngology–Head and Neck Surgery.

Over the past decade, Dr. Azizli has dedicated his career to the subspecialty of laryngology, with a particular focus on voice and airway surgery. His main areas of expertise include voice feminization surgery and voice deepening (masculinization) procedures, which he has performed extensively for both national and international patients.

Dr. Azizli applies advanced surgical techniques such as glottoplasty, laser reduction glottoplasty, and cricothyroid approximation, along with other structural approaches tailored to individual patient needs. Through these procedures, he has developed significant experience in modifying fundamental frequency and achieving stable, natural-sounding results.

In addition to his surgical work, Dr. Azizli actively contributes to academic research and international conferences. His publications and presentations reflect his ongoing commitment to advancing the field of laryngology, with special emphasis on improving outcomes in gender-affirming voice surgery.

By combining technical expertise with patient-centered care, Dr. Azizli has established himself as a trusted voice specialist and a recognized name in this highly specialized area of ENT practice.

Prof. Dr. Engin Dursun was born in 1968 in Erzurum, Türkiye. He graduated from Istanbul University, Istanbul Faculty of Medicine in 1991. After completing his residency training in Otorhinolaryngology at the Ankara Training and Research Hospital, Ministry of Health, in 1995, he worked as a Specialist Physician at the same institution until 2000.

Between 2000 and 2001, Dr. Dursun worked as a Senior Specialist Physician at the 3rd Department of Otorhinolaryngology of the Ankara Numune Training and Research Hospital, Ministry of Health. Between 2001 and 2003, he served as Deputy Chief of Clinic in the Department of Otorhinolaryngology at the Ankara Oncology Training and Research Hospital; and between 2003 and 2011, he continued in the same position at the 3rd Department of Otorhinolaryngology of the Ankara Numune Training and Research Hospital. Between 2011 and 2012, he worked as an Instructor Physician in the same department.

Between 2002 and 2003, he completed a Clinical Fellowship in the Department of Otolaryngology–Head and Neck Surgery at the University of Arkansas for Medical Sciences (UAMS) in Little Rock, Arkansas, USA.

He was appointed Associate Professor in 2005 and promoted to Professor in 2012.

In 2012, he joined the Faculty of Medicine at Recep Tayyip Erdoğan University. Between 2012 and 2021, he served as Head of the Department and as Educational and Administrative Director of the Department of Otorhinolaryngology at the Training and Research Hospital. He also served as Head of the Department of Surgical Medical Sciences, Chairman of the Committee for Specialty Medical Education and Coordination, and as a Founding Board Member of the Undergraduate Medical Education Simulation Center.

In 2021, he was appointed as a faculty member in the Department of Otorhinolaryngology–Head and Neck Surgery, Faculty of Medicine, Lokman Hekim University. He is currently serving at the same institution and continues his duties as Director of the ViTAL (Virtual Training and Learning for Healthcare) Simulation Center; Board Member of the Center for the Treatment, Application, and Research of Cleft Lip and Palate and Related Anomalies (DUDAMER); Advisory Faculty Member of the Center for Innovation in Healthcare and Simulation-Based Education (SİNERG); and Member of the Advisory Board of the Lokman Hekim Health Science Journal. Between 2021 and 2025, he also served as Head of the Department, Clinical Sciences Coordinator for Undergraduate Medical Education, and Year 5 Coordinator.

He has taken active roles in numerous professional societies in Türkiye and currently serves as a Member of the Executive Board and Chair of the Schools Committee of the Turkish Society of Otolaryngology–Head and Neck Surgery. He is also the President of the Otolaryngology–Head and Neck Surgery Association (Ankara) and a member of the General Council of the Turkish Board of Certification in Otolaryngology–Head and Neck Surgery.

His special areas of interest include endoscopic surgery (endoscopic sinus surgery and endoscopic ear surgery), nasal polyposis, head and neck cancers, and medical education with a focus on simulation-based training.