bbPress.org

The following functions would be useful:

//to get the topic author name
bbp_get_topic_author_display_name()

//to get the forum title
bbp_get_topic_forum_title()

Example:

<?php echo 'Started by: ' . bbp_get_topic_author_display_name(); ?>
<?php echo 'in: ' . bbp_get_topic_forum_title(); ?>

You would need to modify the respective template file, depending on where you would like to display the “topic info”

If you could provide more information on what you are trying to achieve, would be happy to help out.