OS X install of Sphinx: The 'sphinx-build' and 'sphinx-quickstart' not found

There have been several 'unanswered' postings on this topic pertaining finding 'sphinx-build' not being able to be found: sphinx-build -h command not found in Mac OS

Sphinx was installed upon OSX using both:

• python3 -m pip install sphinx
• brew install sphinx

In either case, both commands sphinx-build and sphinx-quickstart cannot be found.

Even though python3 -m pip freeze shows installation:

Sphinx==1.3.6

What am I missing?

Thx