Formal Courses of Buddhist Study 
After some 20 years of study with his teacher Khen Rinpoche, Geshe Michael Roach was asked by (mostly laypeople) to teach what he had learned at Sera Mey monastery. These eighteen courses cover what he felt were the most important holy texts and subjects of his geshe studies. They are available for free on the web at acidharma.org and homeworks, quizzes and finals can be mailed in for credit with the Asian Classics Institute. The final three courses review five courses each and must be taken parampara- mouth to ear, from a teacher of the lineage in order to receive credit. They make nice previews of the courses they cover as well. Each class is appoximately 1 1/2-2 hours long, 10 or 11 classes per course. The method of homeworks, quizzes from memory and meditation assignments are to enable the material to penetrate the mind, where it will do the most good! Geshehla says this is how we learn in our culture and it is in keeping with the monastic tradition of learning by listening, contemplating and meditating. There is no charge for Dharma because it's so valuable we could never afford it!
Dharma Essentials 
As an offering to his teacher, Lama Sumati Marut further distilled Geshe Michael Roach's eighteen courses into Dharma Essential-versions. There are generally no homeworks or quizzes and meditation assignments are optional. Classes are informal and encourage discussion and debate. The courses are usually 4 rather than 10 two-hour classes. These recorded courses and more are available for free at lamamarut.org.
Courses in Dallas, Texas
Asian Classics Institute courses are offered 2 or 3 times a year at Prajna Dallas near historic Fair Park. Please see either the Prajna or Schedule links below. More detailed description of the courses may be found at acidharma.org.
ACI 1: Three Principal Paths
ACI 2: Buddhist Refuge
ACI 3: Applied Meditation
ACI 4: Proof of Future Lives
ACI 5: How Karma Works
ACI 6: Diamond Cutter Sutra
ACI 7: Vows of the Bodhisattva
ACI 8: Death and the Realms of Existence
ACI 9: Vowed Morality
ACI 10: Guide to the Bodhisattva's Way of Life part 1
ACI 11: Guide to the Bodhisattva's Way of Life part 2
ACI 12: Guide to the Bodhisattva's Way of Life part 3
ACI 13:Pramana (Logic)
ACI 14: Lojong (Developing a Good Mind)
ACI 15: What the Buddha Really Meant
ACI 16: Great Ideas of Buddhism Part 1
ACI 17: Great Ideas of Buddhism Part 2
ACI 18: Great Ideas of Buddhism Part 3