---- the introductory qualifications of a public TEDx speech & video presented by Dr. James O'Keefe MD at TEDx Talks (USA), 15th November 2016 :-
'This passionate talk from Dr. James O'Keefe MD gives us a deeply personal and fascinating insight into why homosexuality is indeed a necessary and extraordinarily useful cog in nature's wheel of perfection.
James H O'Keefe MD, is a Board Certified Cardiologist and Director of both the Charles & Barbara Duboc Cardio Health & Wellness Center and the Preventive Cardiology service at Saint Luke’s Mid America Heart Institute.
(where the first 3min25sec of his speech covers his fundamental proposition)
---- or alternatively view the same YouTube video of Dr. O'Keefe's 17'25" TEDx presentation in Cool Gay Stuff's right-hand column (video format at right), later accompanied by many appreciative YouTube viewers' comments.