Answer:
True.
Haikun the author of "Past, Present, Future: Unattainable" is a Zen Master.
Step-by-step explanation:
The Zen Master whose full name is Hakuin Zenji was born in Sugiyama Iwajiro, a small Japanese coastal village at the foot of Mt. Fuji.
The poem in question is:
"Past, present, future: unattainable,
Yet clear as the moteless sky.
Late at night the stool’s cold as iron,
But the moonlit window smells of plum".
Cheers!