I know that the Hubble telescope was named after Edwin Hubble, due to his astronomical discoveries of astronomy, but who designed it? Which people were most directly responsible for the inspiring and planning the HST project.
There was no single designer of the Hubble telescope. It was designed and build by NASA, with contributions from the European Space Agency (ESA).
The advantages of a telescope in space have been clear for over 100 years. These ideas were crystallized in Lyman Spitzer's 1946 paper. Spitzer continued to push for a telescope through the '50s and '60s.
When Congress eventually funded the telescope in '78, the task of design was given to the Marshal Space Flight Center. The head of the space telescope project was Dr. Bob O'Dell, chair of the Astronomy dept. at the University of Chicago. In a video from NASA, Dr O'Dell talks about the early years of HST development.
Over the years others have worked as Project Manager. There never was a single "inventor". Hundreds of scientists have been involved in its design and planning. Something as complex as the HST could never be designed by a solo inventor.