Either Stillman knew what he was doing or he didn't.
1	Either	either	CCONJ	_	_	3	cc	_	_
2	Stillman	Stillman	PROPN	SG-NOM	Number=Sing	3	nsubj	_	_
3	knew	know	VERB	PAST	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	_
4	what	what	PRON	WH	PronType=Int	7	obj	_	_
5	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	7	nsubj	_	_
6	was	be	AUX	PAST	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	7	aux	_	_
7	doing	do	VERB	ING	Tense=Pres|VerbForm=Part	3	xcomp	_	_
8	or	or	CCONJ	_	_	10	cc	_	_
9	he	he	PRON	PERS-P3SG-NOM	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	10	nsubj	_	_
10	did	do	AUX	PAST-AUX	Mood=Ind|Tense=Past|VerbForm=Fin	3	conj	_	SpaceAfter=No
11	n't	not	PART	NEG	_	10	advmod	_	SpaceAfter=No
12	.	.	PUNCT	Period	_	3	punct	_	_
