Apologist Ravi Zacharias died Tuesday, May 19, 2020, two months after he announced he had been diagnosed with cancer. He was 74.

The popular author and Christian teacher was known for his work through Ravi Zacharias International Ministries (RZIM), which focused on apologetic arguments for the existence of God and the reasonableness of Christianity.

He preached in more than 70 countries and authored more than 30 books in his 48-year career, teaching Christians to engage with skeptics and arguing that the Christian worldview has robust answers to humanity’s existential questions.

Zacharias was born in India and raised in an Anglican family.