Speusippus was an ancient Greek philosopher, nephew and successor of Plato. He resided at Plato's academy for eight years, where he was noted for debauchery and extravagance. Plato attempted to curb him, but without effect. He died either of suicide or a wasting disease.
--This material is extracted from the 1824 Lempriere's Dictionary
SPEUSIPPUS (4th century B.C.), Greek philosopher, son of Eurymedon and Potone, sister of Plato, is supposed to have been born about 407 B.C. He was bred in the school of Isocrates; The Sperm-Whale (Physeter macrocephalus).
The head is about one-third of the length of the body, very massive, high and truncated in front; and owing its size and form mainly to the accumulation of a peculiarly modified form of fatty tissue in the large hollow on the upper surface of the skull.
Thus while Plato hoped to ascend through classificatory science to the knowledge of eternal and immutable laws of thought and being, Speusippus, abandoning ontological speculation, was content to regard classificatory science not as a means but as an end, and (6) to rest in the results of scientific observation.
Speusippus of Athens was the son of Plato's sister Potone; he became head of the Academy on Plato's death in 348/347 and remained its head for eight years (Diogenes Laertius iv 1), apparently until his death.
Speusippus and the entire old Academy say that pleasure and pain are two evils opposed to each other, but that the good is what is in the middle between the two.
Assuming that we correctly understood Speusippus' response to the Universal Pursuit Argument, (2), (3), and (6) are consonant with that response.