International Language Institute, DC | 685 followers on LinkedIn. 50 years of providing high-quality language instruction at a superior value. | The International Language Institute (ILI) was founded in 1970 when it began its operations with four English as a Second Language (ESL) teachers and about 15 students. For over 50 years, our company has seen steady growth and developed a strong reputation around the world and locally for quality language training and academic preparation at a superior value. Today, we have hundreds of new students every year.