Lack at one point classified his type of painting as "Classical Realism," and some Wikipedia information on the subject is here.
If you happen to be in the Pacific Northwest before 15 November, you might be able to visit an exhibit of his work at the Maryhill Museum located about 90 miles up the Columbia River from Portland, Oregon.
I greatly respect Lack's talent and courage in opposing dominant fads and fashions in painting. On the other hand, his style is a little too "finished" for my taste. Also, I find it hard to like the Symbolic subjects that he began to paint around 1970 and continued to do for much of the rest of his career.
Below are images of some of his paintings along with a few photos I took at Maryhill in September.
Pictured is a friend of his.
Lack met this Hungarian-born lass in 1953 and married her two years later.
Lack was an enthusiastic musician and painted a number of scenes dealing with that subject.
Most of lack's studies included in the exhibit (there were many) were even more finished than this one.
The previous painting is at the far left and a pose sketch is at the right of the final work.
Lack also painted landscapes and still lifes.
Lack studied under R.H. Ives Gammel (1893-1981) who, in turn, studied under William McGregor Paxton (1869-1941).
A Symbolist painting on a religious theme. His Symbolist subjects also were influenced by psychiatrist Carl Jung.