Around 1995, he began holding seudah shlishit at the Satmar beis medrash in the Ezrat Torah neighborhood, attended by Breslov Hasidim.

For years, he traveled to Uman for Rosh Hashanah with hundreds of followers from Israel, England, and the United States, who joined his minyan there.

[5] In subsequent years, he remained in Jerusalem, sometimes traveling to Uman on the eve of Rosh Hashanah and returning to Israel for the holiday.

His eldest son, Yisrael, married the daughter of Rabbi Pinchas Moshe Taub, the Rebbe of Kozmir, in 2015.

Morgenstern has developed meditation methods based on Kabbalistic sources, summarized mainly in the Derech Hayichud section of the Yam Hachochma collection.

[10] Despite the theological complexity of Kabbalah, he believes it must align with the simple faith common among the Jewish people, even though some Kabbalists think otherwise.

He stands out among the kabbalists following the Rashash's path by instructing to direct prayer intentions even during times like the days of the Omer counting and the days between Rosh Hashanah and Shemini Atzeret, unlike the custom of Beit El and most of the Rashash's students, relying on the Torat Chochom.

[13] Although he does not formally rule on halacha and usually refers questioners to recognized authorities,[14] he engages in halachic inquiries published in the Yam Hachochma and Neshmatin Chadatin collections.

He tends to pray at very late hours, relying on unique opinions regarding the times of day for prayer, noon, sunset, and nightfall, following the approach of the Maharshal.

He prohibits the One Brain method (a type of applied kinesiology where questions are asked, and answers are received through muscle testing),[18] considering it a form of sorcery.

The Rebbe of Amshinov, who permits the method, remarked that of all those who oppose his view, Morgenstern is the only one who shows the prohibition side.