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I know he designed these:
Liberia 1974 UPU set (Scott #663-668, C201)
Liberia 1973 World Health Org 25th Anniversary(Scott #641-646, C198)
I only collect up to 1960 so I don’t have a lot ofreferences beyond that. Most Liberian stamps of the 1950s –early 1970swere printed in Philadelphia, PA, United States. I am guessing that G. L.Vasarhelyi worked for Format International, Ltd of UK. FormatInternational did print a lot of Liberian stamps starting around 1973 but I donot have any information on who the designers were.
Hope this helps.