Wes Wilson was an American designer born in 1937 and known for creating the first psychedelic posters of the 1960’s. His work involves freehand lettering, contrasting colours, art nouveau inspiration, flowling lines, multiple patterns,  etc, all of which have become common characteristics of psychedelic posters. Wilson initially started as a layout designer but eventually started making concert posters for people such as Bill Graham and Chet Helms. Surprisingly, the ineligibility of his poster fonts is what contributed to the craze of it. In fact, when Graham questioned why people would look at this poster if they can’t understand it, Wilson replied “They’ll stop to read it because they can’t read it.” His posters got so popular that people started pulling them down and collecting them before they could even be put up. The impact of his posters continues to have an effect today on major fashion brands such as Dries Van Noten and Olympia -Le Tan who replicate his images and on their products as his style still continues to gain attention. 

95.663 01_b01, 3/11/04, 5:40 PM, 8C, 3386×5000 (92+0), 62%, flat 8 stops, 1/60 s, R18.4, G2.3, B20.6

Sources:

https://www.collectorsweekly.com/articles/psychedelic-poster-pioneer-wes-wilson/

https://posterhouse.org/blog/wes-wilson-from-art-nouveau-to-psychedelic/