Denis started his career in the Refugee-Law-Clinic Bochum, as a legal consultant. He is the author of several articles published by the Human Rights League of France. Denis has been a delegate for ELSA international NGO in the committee on enforced disappearances. He graduated from the Strasbourg University as a Master of fundamental Rights. Since then he is pursuing his second Master degree in Human Rights and international humanitarian law at the Pantheon-Assas university in Paris.