Old site had "Experts" section

With the new site it appears there is no way to contact the Experts to whom a party could appeal for additional help, or even research. Are those experts now precluded from participating? Eg., I’m seeking an independent landman for a quick lease lookup in Northern Oklahoma, and separately professional advice on a tricky lease situation.

What you are referring to is in the “Blogs” Category. Simply use the onboard search icon, the spyglass, and search on the word Blogs. You’ll find it. Then, since search is contextual on this site, you can use the search function again to search on key words of interest to you within that Blogs Category.