He is also of the school that the wet approach is the only approach, (doesn't mean he's not attain just that his dogmatic) and for the wet approach, he take it one step further. Saying that you need to master all the Samatha Kammathana and each to the highest lvl of jhana that that object can be attianed too, i.e. metta can only go to third jhana. I might go to hell before all that happens- not to meantion i better be good at concentration practice.
Forty meditation subjects
kasina: (1) earth, (2) water, (3) fire, (4) air, wind, (5) blue, green, (6) yellow, (7) red, (8) white, (9) enclosed space, (10) bright light.
(asubha)

1) swollen corpse, (2) discolored, bluish, corpse, (3) festering corpse, (4) fissured corpse, (5) gnawed corpse, (6,7) dismembered, or hacked and scattered, corpse, (8) bleeding corpse, (9) worm-eaten corpse, (10) skeleton.
Ten are recollections (anussati):
First three recollections are of the virtues of the Three Jewels:
(1) Buddha
(2) Dharma
(3) Sangha
Next three are recollections of the virtues of:
(4) morality (Śīla)
(5) liberality (cāga)
(6) the wholesome attributes of Devas
Recollections of:
(7) the body (kāya)
(8) death (see Upajjhatthana Sutta)
(9) the breath (prāna) or breathing (ānāpāna)
(10) peace (see Nibbana).
Four are stations of Brahma (Brahma-vihara):
(1) unconditional kindness (mettā)
(2) compassion (karuna)
(3) sympathetic joy over another's success (mudita)
(4) evenmindedness, equanimity (upekkha)
Four are formless states (four arūpajhānas):
(1) infinite space
(2) infinite consciousness
(3) infinite nothingness
(4) neither perception nor non-perception.
One is of perception of disgust of food (aharepatikulasanna).
The last is analysis of the four elements (catudhatuvavatthana): earth (pathavi), water (apo), fire (tejo), air (vayo).