Rav Moshe Tendler

 https://mishpacha.com/brilliant-mind-golden-heart/

 As a son-in-law of the posek hador, Rav Moshe Tendler quickly became a major figure in Rav Moshe Feinstein’s positions on Jewish law and bioethics, writing many articles in prominent medical and Torah journals alike.

 

 This was a major problem in the yeshiva world as he and his son would assert that a certain view was from Rav Moshe and it wasn't accepted as such.

I once net him at a simcha and said to him,"Since you are the main source of Rav Moshe's knowledge of scientific information Why did Rav Moshe state that Natural child birth  is merely a trick to convince the woman she is not experiencing pain?" He replied that he "was not Rav Moshe's main source and that though he was not aware of this particular tshuva which is in Igros Moshe he agreed fully with it."

 

When Rav Moshe was niftar I was told that a number of major poskim went to Rav Dovid and asked him to clarify the major disputes regarding Rav Moshe's true views. He replied "let them believe what they want but I refuse to get involved in a public dispute in these matters." I was also told that this was in fact Rav Moshe' own attitude toward public disputes. As a consequence there is still not a clear view on many issues.