Orgyen Tendzin Norbu (o rgyan bstan ‘dzin nor bu, 1841–1900) is something of an elusive figure in recent Nyingma history. Until recently, not much was known about his life, and even his dates were a mystery; his own writings appear to have been lost, and his final testament, recorded in the few brief biographies available to us, is decidedly enigmatic.
And yet he was certainly important, especially in the Nyingma scholastic tradition, not least as an intermediary between Gyalse Shenpen Thayé (rgyal sras gzhan phan mtha’ yas, 1800–1855) and Khenpo Shenga (gzhan dga’) or Shenpen Nangwa (gzhan phan snang ba, 1871–1927). Shenpen Thayé was Orgyen Tendzin Norbu’s uncle and the founder of the famous Shri Singha college at Dzogchen Monastery, and Shenga, his most illustrious disciple, helped, through his writings and teaching, to inspire a flourishing of scholasticism in early twentieth century Kham. Yet Orgyen Tendzin Norbu was more than simply a human bridge linking these two more prominent lamas; having studied with Dza Patrul Rinpoche (rdza dpal sprul o rgyan chos kyi dbang po, 1808–1887) for thirty years, he became an acknowledged scholar, Dzogchen master and important teacher in his own right.
Biographical information on Orgyen Tendzin Norbu was hard to come by until recently, and his dates are still quite muddled in the various sources. Some, including TBRC, give 1851 as the year of his birth, but, as recently pointed out in a comment on the Treasury of Lives site (on the Khenpo Shenga article) this date no longer seems tenable. Tulku Thondup did not provide any specific dates in his biography in Masters of Meditation and Miracles (pp. 226–227), and noted simply that Orgyen Tendzin Norbu lived in “the 19th century.” Nyoshul Khenpo’s Dzogchen history (2005, p.482) offered 1827–1888, based on the idea that the master passed away at the age of sixty in the earth-rat year (1888–9). Yet, according to Tendzin Lungtok Nyima (2004, p.594) in his vast history of Dzogchen Monastery and its associates, while Orgyen Tendzin Norbu did indeed live for sixty years, he died not in the earth-rat, but in the iron-rat year, i.e., 1900–1. This date, which has since been reproduced in other historical works published in Tibet, seems for the moment to be the most reliable.