Rabbi Pesach Oratz was a much loved teacher of Tanach, who left behind many hundreds of talmidim and talmidos to whom he imparted a a lasting love of, and a desire to strive for deeper understanding of, limud hatorah. (see, e.g., http://www.yucommentator.com/2.2843/it-and-not-about-it-1.299219)
Rabbi Oratz's legacy continues to walk the Earth in the persons of his proudest achievement, children who manifest in their own lives his mesora of ahavas hatorah, kiruv levavos, and seiver panim yafos.
The family is not sitting shiva anymore, because Rosh Hashanna was mafsik, but condolences can be sent to
המקום ינחם אתכם בתוך אבלי ציון וירושלים
Rabbi Yitzchak Oratz shlita sent a few beautiful and inspiring stories about his father. I am copying them to the post so that more people can learn from his legacy.
(Just to clarify, my father wasn't CH"V doubting the Chazal, he just wanted to clarify -- but he learned from Rav Moshe the chashivus of a maamar Chazal & the choymer we take their words.)