As a teacher for the past 20 years, Andrés has trained over 1500 voices around the world, from «shower» singers to Grammy winners, several Multi-Platinum record singers, Number 1 US Billboard artists, actors and more.

Andrés has worked for the largest singing institutions in the world, including SLS (USA) and CVI (Denmark), teaching singing teachers. He has also developed his own course for teachers at the Modern Vocal Training Institute.

Andrés, with his wife Magda, lead the largest voice camp in the world («European Vocal Camp») and the «World Voice Teachers Expo.» Since 2010, Andrés has been a Vocal Coaching lecturer at the National University of Ireland (NUIG), where he created his own Oratory program at the Masters of Conference interpreting, and he also lectures in the Faculty of Medicine, regularly.