Professor Jeff S
"Specialization is for insects" (Robert Heinlein). While most of these videos relate to college-level and pre-service mathematics, you'll find videos on other topics as well.
If you're looking to learn mathematics, then it is my objective and completely unbiased opinion that these are the best video lectures available anywhere: trust me, I'm on the internet.
But learning mathematics takes a little more than just watching videos. It's like becoming a tennis player. You can watch all the videos you want on how to throw a touchdown, but sooner or later you have to jump into the water. I've put together the videos in a self-directed study site; you can find more information about it at:
https://www.myopenmath.com/course/public.php?cid=107664
Solving Set Problems: Three Or More Sets
Venn Diagrams: Three Sets
Solving Set Problems Using Venn Diagrams; Two Sets
Introduction to Venn Diagrams
Joint Exponential Distributions
Joint Distributions: Continuous PDFs
Complementary Expectations
Joint Conditional Expectations
Expectations of Joint Distributions
Joint Distributions: Conditional Probabilities
Joint Distributions: Discrete Case
Exponential Distribution: Variance and Standard Deviation
More Memoryless Distributions
The Exponential Distribution: The Memoryless Property
The Mean of the Exponential Distribution
The Exponential Distribution
Expected Value and Variance of a Geometric Distribution
Geometric Distribution: The Cumulative Distribution Function
The Geometric Distribution
Variance of a Sum
Introducing the Variance
Expected Value of a Sum
Expected Value of a Function
Expected Value
Cumulative Distribution Functions (Discrete Random Variables)
Probability Mass Functions
Solving Ratio Problems
Two Way Contingency Tables
Probabilities of Compound Events
Equally Likely Outcomes