The default Q&A display lists "Most Active" experts first. Activity is determined by the number of questions answered in the last 28 days. Experts that haven't answered anything during that period are sorted by total amount of answered questions. Naturally, listings for "inactive" experts appear after the "active" group of experts. Experts that haven't answered any questions yet are sorted by their sign-up date, most recent ones first.
You further have the option to sort experts according to the following filtering criteria:
- by "Latest Answers"
- by total number of questions answered ("Top Experts")
- by "Newest Experts"