Rav Moshe and Rav Aharon

 https://mishpacha.com/standing-up-for-greatness/

Rav Aharon then picked up the phone and called Rav Moshe in what turned out to be a discussion that lasted close to 40 minutes. And for the duration of the entire phone call, Rav Aharon remained standing. Rav Elyashiv told me that he tried several times to push a chair closer to Rav Aharon so he could sit down, but he just ignored his overtures.

When the call finally ended and Rav Aharon shared Rav Moshe’s psak with him, Rav Elyashiv thanked the Rosh Yeshivah for his time, and then asked him why he would not sit down while on this long phone call.

Rav Aharon responded, “Is it possible to sit down while talking to Rav Moshe Feinstein?”