Dr. Marco Antonio Guzman is voice pathologist with over twenty-three years of clinical and academic experience. He earned his Ph.D. in Vocology from Tampere University, Finland, and holds certifications in vocology from the University of Iowa and the National Center for Voice and Speech, USA. He currently serves as an associate professor at the Speech-Language Pathology School of Universidad de los Andes and works clinically in the Otolaryngology Department at Clínica Las Condes. Since 2018, he has been an adjunct professor at Tampere University (Finland) and, since 2022, a faculty member of the Summer Vocology Institute at the University of Utah. He also acts as a guest lecturer for the Master of Clinical Vocology program at the University of Bologna, Italy. Dr. Guzmán is a member of the editorial board of the Journal of Voice and an advisory board member of the Pan American Vocology Association (PAVA). His main research lines focus on the effect and efficacy of semioccluded vocal tract exercises for voice treatment and training. Numerous studies have been conducted to analyze aerodynamic, acoustic, morphometric, and perceptual changes related to these exercises. Additionally, randomized controlled clinical trials have evaluated different physiological therapeutic protocols for patients with voice disorders. Research also includes vocal tract constrictions in professional voice users, contributing to the physiological understanding of this phenomenon during singing and