Who is Paramahansa Yogananda, Mukunda Lal Ghosh from Autobiography of a Yogi and what is their importance?

Paramahansa Yogananda, Mukunda Lal Ghosh is the main subject in the book. He knew early on that he wanted to seek enlightened teachings, but although his family was supportive, they didn't want him to give up his studies at universities. He finally did go study and developed kriya yoga which he eventually brought to the US.