Conference out of this world

For the 9th time, we invite you to the
International Scientific Seminars! - online again.

Media patronage



Hours of knowledge and practice


Zoom platform


40-102 $/€



We have invited experts from Europe and the USA, so that you have access to the latest knowledge on voice, vocal pedagogy and such related fields as: speech therapy, phoniatrics, laryngeal surgery, acoustics and technology.

What can you expect?

Learn about the ways to work with the greatest Broadway stars from our first Tony Award-winning speaker - famous voice trainer and voice therapist Joan Lader!

Learn about the techniques and technology that make your online voice lessons fun and effective.

Or maybe you are interested in the latest surgical procedures for transgender people who want to change their voice, presented by the greatest authority in the field - Markus Hess?

How can one person sing polyphonically?How does the amazing technique of overtone singing work? One of the best and most recognized polyphonic/overtone singers in the world - Anna-Maria Hefele - will tell us all about it.

How do you rehabilitate a singer if you are the most famous speech therapist in the USA and the President of the Vocology Association - Katherine Verdolini Abbott?

What kind breath is correct? New views will face old ones - we want to see it!

Be among the best-informed singers, singing teachers and specialists!

International Scientific Seminars schedule:

Friday 18/11/2022
Teacher training

UTC+ 01:00
UTC+ 01:00
Joan Lader (USA)

Technique, Musicianship, Storytelling: Tools in the Box for Musical Theater

Teacher training session focused on preparing the voice and body for musical theater. Learn how to care for the voice. Gain insights on how Joan Lader uses a variety of tools with students and professionals in Musical Theater.

We provide later access to the presentation and video recording of this lecture.

UTC+ 01:00​
Sam Johnson (USA)

How to Teach Voice Online?

This lecture will teach you how to teach an online voice lesson with just a cell phone, and different ways to upgrade your equipment to offer a high quality product.

We provide later access to the presentation and video recording of this lecture.

UTC+ 01:00
Prof. Katherine Verdolini Abbott (USA)

Voice training and therapy for singers: Special issues

This lecture will address common voice challenges in singers and how they maybe addressed in voice training and therapy. A particular focus will be principles in  biomechanics, wound healing, and motor learning. Data and demonstrations will be provided.

We provide later access to the presentation and video recording of this lecture.

Sunday 20/11/2022

UTC+ 01:00
Marcus Hess, MD, PhD (Germany)

Transgender voices - modern approach, care, surgical procedures

Voice feminization is one of the ‘hottest’ topics in laryngology. With the introduction of Wendler’s glottoplasty, there saw an upheave in surgery requests for transgender women. In this lecture, we will focus on our institutional experiences in how to provide high-quality voice feminization treatment (in-person and online with telemedicine communication). Our multidisciplinary treatment and coaching includes conservative treatment, socio-cultural aspects as well as details of laryngeal surgery.

We provide later access to the presentation and video recording of this lecture.


UTC+ 01:00
Anna-Maria Hefele (Germany)

Overtone singing – acoustics, research and learning

Overtone singing is a fascinating vocal technique where it seems like one person is singing two notes at the same time. This happens by filtering and amplifying the harmonics that are contained in the sound of the human voice through specific and precise modulations of the tongue and the vocal tract.

In the western style of overtone singing it is worked without pressure on the larynx. This allows a flexible use of overtone singing technique while keeping up the ability to perform other singing styles. 

Overtone singing can be used artistically as a musical instrument or it can function as an educational tool for singers, choral conductors and voice teachers. The capability of being able to hear and control the harmonics in the voice refines the singer‘s audio perception regarding timbre and vowel colour and improves blending and intonation in any vocal ensemble.

We provide later access to the presentation and video recording of this lecture.

UTC+ 01:00
Christian Herbst, PhD (Austria)

Oldies but goldies - some old (and sometimes overlooked) physiological concepts of breathing for singing

In this presentation, I will review and discuss a number of quintessential physiological concepts of breathing during singing. In particular, I will talk about (a) passive restoration forces of the pulmonary apparatus; (b) the so-called "tracheal pull"; and (c) Ohm's law. These concepts are not new, but are sometimes overlooked in more recent pedagogical texts.

UTC+ 01:00

Meet our experts

prof. Katherine Verdolini Abbott

Professor, Communication Sciences and Disorders and Linguistics and Cognitive Science, University of Delaware President, Pan American Vocology Association Dr. Verdolini Abbott is a voice scientist, speech-language pathologist, and singer. She earned her PhD in Experimental Psychology/Cognitive Science from Washington University in St. Louis in 1991. Her prior academic appointments include the University of Iowa, Harvard Medical School, and the University of Pittsburgh. She is currently Professor of Communication Sciences and Disorders and Linguistics and Cognitive Science at the University of Delaware. Her research has been funded by the National Institutes of Health since 1997, and has addressed a wide range of topics in voice including hydration, biomechanics, wound healing, exercise physiology, emotions, motor learning and control, and clinical trials in voice. A recent interest regards biological and cognitive influences in pediatric voice. She is a Fellow of the American Speech-Language-Hearing Association from which she received the highest honors in 2009.

Anna-Maria Hefele

Holding a master of arts (MA) from Mozarteum Salzburg – is a multiinstrumentalist, singer and overtone singer; performing worldwide as soloist with different ensembles, choirs and orchestras. She is also frequently integrated in contemporary ballett, circus and dance theatre productions. In order to expand the musical repertoire involving overtone singing, Anna-Maria collaborates with contemporary composers who are writing for this particular vocal technique where it seems like one person is singing two notes at the same time by filtering and amplifying the natural harmonics in the human voice. Her YouTube video „polyphonic overtone singing“ became viral and has resulted in more than 19 million views so far, followed by regular appearances of Anna-Maria in various international television shows and radio broadcasts. „A voice as from another world“, „the lady with the two voices“, „polyphonic vocalist does the impossible“ - these and other headlines have spread across the world.

Joan Lader

Joan Lader’s more than thirty-five years of providing vocal training and rehabilitation for professional voice users was commemorated in June 2016 when she was awarded the American theater’s highest honor, a Tony Award for “Excellence in the Theater.” Ms. Lader received a BFA from Penn State University in Theatre Arts with a Minor in Music. Trained as a Master’s level speech pathologist, she specializes in working with singers and actors, and in collaboration with New York’s top otolaryngologists, rehabilitation of injured voices. Her extensive practice includes leading actors and singers from Broadway, film, opera, R&B, rap, rock and pop. Ms. Lader is a certified Master Teacher of the Estill Voice Training System, is a member of NYSTA, VASTA, and has extensive training in the Alexander Technique, as well as Fitzmaurice Voice Work and the work of Arthur Lessac. She has given Master Classes at universities and summer programs throughout the country, is a consultant at NYU’s The New Studio and is on the advisory board of the Voice Foundation and the Manhattan School of Music. Three years ago, Ms. Lader gave the keynote address at the Northwest Voice Conference on the Art and Science of the Performing Voice. She has contributed numerous articles in many educational and professional books on various aspects of vocal production and care of the professional voice, as well as exercises for voice therapy. Ms. Lader was also recently the featured guest on a NATS chat that was broadcast nationally. She is particularly proud to be a Master Teacher with the National Young Arts Foundation, whose participants so often become the stars of tomorrow.

Dr Christian T. Herbst

An Austrian voice scientist. He studied voice pedagogy at Mozarteum University, Salzburg, Austria, and worked as a voice pedagogue for about two decades. Driven by his interest in the physics and the physiology of voice, he enrolled in a PhD programme in Biophysics at the University of Olomouc, Czech Republic, from which he graduated in 2012. He has been active as a full-time voice researcher ever since. Christian is currently affiliated with the Department of Vocal Studies, Mozarteum University Salzburg, Austria, and serves as an adjunct guest professor for the Janette Ogg Voice Research Center, Shenandoah Conservatory, Winchester, VA, USA. The focus of Christian’s scientific work is both on singing voice physiology, and on the physics of voice production in mammals. He received several international scientific awards, and has published, among others, in the prestigious Science journal.

Sam Johnson

Sam Johnson is a singer, voice teacher, and YouTuber based out of Austin, Texas. He is the Educational Director of IVTOM (International Voice Teachers of Mix) and has a bachelor’s degree in Vocal Performance from Westminster College in Salt Lake City. Sam has been teaching voice for over ten years, including eighteen months at CSMA Studio in Hong Kong, the premier vocal studio in the area. He now works entirely online with a studio of passionate adult amateurs and professionals. His Youtube channel focusing on vocal analysis and education has 674,000 subscribers and over 85 million views.

Prof. Dr n. med. Markus M. Hess

Markus Hess, MD, is a dedicated otolaryngologist and phoniatrician, subspecializing in laryngology, phonosurgery, and professional voice use. Graduation in Düsseldorf and Berlin. Since 1991 board-certified otolaryngologist, since 1995 board-certified phoniatrist. In 1998 he accepted a full professor position at the University Medical Center Hamburg-Eppendorf in Phoniatrics. He is co-founder and Head of the first Voice Clinic in Germany since 2014, the MEDICAL VOICE CENTER in Hamburg. He specializes in the care of the performing voice and the treatment of voice disorders. Dr. Hess has long-standing experience in performing endoscopic and open surgical procedures on the larynx. He has invented many techniques for diagnostics and surgical interventions in laryngology and holds a patent on LED-stroboscopy. Dr. Hess brings a multidisciplinary approach to such patients as singers, actors and public speakers. His surgical patients receive cutting-edge minimally invasive techniques in laryngeal microsurgery as well as office-based voice surgery in topical anesthesia. Dr. Hess has authored and co-authored over hundred peer-reviewed articles. He is chair of Pan European Conferences (PEVOC) since 2015, a founding member of the ‘German Society of Phonosurgery’, founder and Executive Board member of the European Academy of Voice (EAV), Past-President of the international Collegium Medicorum Theatri (CoMeT) 2015-2018, Secretary General of International Association of Phonosurgery (IAP), co-founder and first president of the International Association of TransVoice Surgeons. He serves in multiple capacities on many international editorial and scientific boards and committees. Dr. Hess teaches regularly at national and international voice conferences and runs own courses in cutting-edge phonosurgery techniques.

Join us and sign up!

If you want to sign up for the Conference and make a payment in dollars or euros, write an e-mail with the application containing information which participation option do you choose (given below) and your personal data (name, surname, adress, payment method) to the following address: Then make a transfer to one of the accounts below or you can do it via PayPal using the e-mail address:

Alior Bank

Stowarzyszenie Wokalistów MIX
Adress: ul. Hłaski 18, 44-100 Gliwice, Poland
  • EUR
    IBAN: PL38249010570000990282796822
  • USD
IBAN: PL91249010570000990182796822



Scientific Seminars „Voice-Body-Expression”: Teacher Training FRIDAY + SUNDAY
Scientific Seminars „Voice-Body-Expression”: FRIDAY only
Scientific Seminars „Voice-Body-Expression”: SUNDAY only

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