Rennert offers small Group classes in 8 languages: Spanish, French, German, Arabic, Mandarin, Japanese, Portuguese and Italian. Corporate Language Training and Private classes are also available in any language of the student's choosing. What is the basis of Rennert's longevity? It's our people. Our teachers are carefully chosen for their academic and professional backgrounds, their dedication to their students, and their ability to teach effectively. Our administrators are friendly and are intensely committed to the development and satisfaction of our foreign language students.