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Marian Croak - History of innovation comes in bursts
Change for the Greater Good: The Marian Croak Story
Dr. Marian Croak: Inventor of VOIP | Innovation Nation
Marian R Croak
#rediscoveringhistory Marian Croak inventor of Voice over IP and holds over 200 Patents
Marian Croak - Have a mindset that problems are solvable
Inventor Card Unveiling: Marian Croak
BLACK INVENTORS | DR MARIAN CROAK |THE BLACK INVENTOR OF SKYPE!
Speaker Series: Marian Croak
Dr Marian Croak American Black Excellence
Marian Rogers Croak - Audiobook Excerpt from African American Inventors and Scientists
An Insight with Marian Croak and Lindiwe Matlali | Pioneers of Change
