How to get a buddypress user profile link and a certain user profile field for the current post author?

Question

I want to replace get_author_link() and get_the_author_meta($feld)

with something equivalent to point to the author of the current post Buddypress user profile page and retrieve a specific profile field from his Buddypress page

ie, I just want to show a link to the post user profile and a biography from one of his BP profile fields

I'm not sure which functions I should use for this... BuddyPress documentation is still not very clear unlike the WP Codex...

thanks