Harold Mabern December 23, 1968
Bruyninckx and Lordisco list the recording location as NYC, but jazzdisco.org says it was at Rudy Van Gelder studio in Englewood Cliffs, NJ. However, websites like Amazon and Cduniverse that sell issues of this session by Prestige cite it as Rudy Van Gelder, including the online magazine NME. While we are hesitant to outright contradict Bruyninckx and Lordisco, it seems likely that it was Rudy Vangelder studios where this session took place, since people with the issue on hand seem to say that, which leads one to believe that it says as much in the liner notes.
This photograph of the back of the LP issue lists Rudy Van Gelder as the producing engineer, which would again seem to contradict Bruyninckx and Lordisco's listing of NYC as the location of the session: http://www.auctiva.com/hostedimages/showimage.aspx?gid=1230229&image=346553642&images=346553624,346553642,346553657,346553668&formats=0,0,0,0&format=0