Tulku Urgyen Rinpoche (1920-1996) was one of the outstanding Tibetan Buddhist teachers of his generation. Forced into exile by the Communist invasion of Tibet, he came to settle in the Kathmandu Valley in Nepal. Though spending over 25 years in retreat, he not only taught extensively, but also founded numerous monasteries and retreat centers the world over. He is the author of such popular books as Rainbow Painting and As It Is Vols. I & II.
From the Trade Paperback edition.

The collection of teachings presented in As It Is, Volume II, is selected from
talks given by the Tibetan meditation master Tulku Urgyen Rinpoche between
1994 and 1995. The emphasis in Volume I was on the development stage
practice; Volume II focuses primarily on the completion stage.
Tulku Urgyen Rinpoche was someone with extraordinary experience and
realization, a fact known throughout the world. It is evident to everyone
that he was unlike anyone else when it came to pointing out the nature of
mind, and making sure that people both recognized it and had some actual
experience.
-Khenchen Thrangu Rinpoche
Tulku Urgyen Rinpoche was an incredible master, one who was both learned
and accomplished. The great masters of this time-the 16th Karmapa,
Dudjom Rinpoche and Dilgo Khyentse Rinpoche-all venerated him as one
of their root gurus and a jewel in their crown ornament. He was someone who
achieved the final realization of the Great Perfection.
-Orgyen Tobgyal Rinpoche

The difference between buddhas and sentient beings is that sentient beings
are busy fabricating. Our self-existing wakefulness has fallen under the power
of being altered. As long as we continue to do so, we will wander in samsara.
Rather than doing that, we need to recognize the nature of mind. I am
explaining this here to give you the idea of how things are. The next step is
for you to experience. Intellectual understanding is not enough. You need to
actually taste and realize this self-existing wakefulness. Train till it becomes
uninterrupted