Masters and Guru Yoga
Padmasambhava a very well known master who brought buddhism and dzogchen-teachings to Tibet is our main master. However we draw inspiration from the blessings and teachings of a several other masters as well.
Guru Yoga is a meditative practice which means "the student tuning into the presence of the guru". This is done by repeating the mantra (tuning in) and then feeling in your own body the presence and energy of the master (guru yoga, guru meditation, skt. guru dhyana). Guru Yoga is also done briefly at the beginning of each practice session when you ask blessings from the master for the happiness and liberation of all living beings.
Remembering one's master and tuning into his presence can not be emphasized too much.
However, this does not mean that a teacher or master should be seen to be higher than the student. Both the teacher and the master should be seen as a friend, supervisor and a specialist when it comes to spiritual matters.
Padmasambhava and other masters
Other masters of importance: