[vram22]

"He practiced Advaita vedanta."

A bit pedantic, and I could be wrong, but based on what I've read, my understanding is that Advaita (non-dualism) is not something you can practice, although there are practices in that school that can advance you on the path, like shravana, manana, nidhidyaasana.

It's more of a reasoning-, knowledge- and understanding-based system than anything else.

Jnana Yoga is the path.

Check out Swami Sarvapriyananda's talks on YouTube about Advaita.