This is something shared to a Facebook page and I have added it here for your reference.
If you don't know who Paul Thomson you may know his dragon fruit creations Dark Star, Cosmic Charlie ,PT7 Physical Graffiti , Purple haze and more.
Paul Thomson's work, particularly in expanding the farming of exotic fruits, including pitahayas (dragon fruit), has played a role in diversifying agriculture in the region.
His involvement in co-founding the California Rare Fruit Growers Association further indicates his passion for promoting the cultivation of unusual and rare fruit varieties.
It's important to note that individuals like Paul Thomson, who dedicate themselves to the cultivation and promotion of unique crops, play a crucial role in expanding agricultural diversity and contributing to horticultural knowledge.
Paul Thomson died on May 31, 2008, at the age of 91.
Below is a link to his book on Pitaya.
file:///C:/Users/yana3/Downloads/Improved_Paul-Thomsons-Pitahaya-Book.pdf