Both are black founders - but there's so much more on Mixergy that you should check out. Andrew Warner is pretty awesome at that stuff.
I particularly liked Ephren's interview, I've been listening to Mixergy for a number of months now and he is still a stand-out for me.
EDIT I just remembered that Peter Gruber tells a great story about Magic Johnson pitching him on a chain of movie theaters.
http://mixergy.com/peter-guber-interview/
I need to do a better job of finding even more black founders for Mixergy. If anyone wants to help me connect with successful, please email me: http://mixergy.com/contact