chief executive officers involved in USG Corporation

List chief executive officer or chief executive, a highest-ranking corporate officer or administrator in charge of total management of an organizations someone who had a significant role (whether creative, executive, participatory or other) in USG Corporation, also known as United States Gypsum Corporation, the Fortune 500 (rank 396 in 2007) company that manufactures construction materials

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Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is June 18th 2013, 23:54:24

I know from locally stored knowledge that:
is someone who had a significant role in is a more general form of is a company director of ([fact: ["1230884974@trueknowledge.com"]])

permanent applies to is someone who had a significant role in ([fact: ["1230546550@trueknowledge.com"]])

Fact 1: Steven F Leer is a company director of USG Corporation ([fact: ["233941611@trueknowledge.com"]])

Fact 1 is true for January 13th 2009 onwards ([fact: ["653115836@trueknowledge.com"]])

By calculation (generator: ["moregeneral4@trueknowledge.com"]) I know that:
Fact 2: Steven F Leer is someone who had a significant role in USG Corporation

By calculation (generator: ["moregeneral1@trueknowledge.com"]) I know that:
Fact 2 is true for January 13th 2009 onwards

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 2 is true at June 18th 2013, 23:54:24

I know from locally stored knowledge that:
Fact 3: Steven F Leer is a chief executive officer ([fact: ["702436600@trueknowledge.com"]])

Fact 3 is true at June 18th 2013, 23:54:24 ([unknown object])

Fact 4: Judith A. Sprieser is a company director of USG Corporation ([fact: ["232391215@trueknowledge.com"]])

Fact 4 is true for January 13th 2009 onwards ([fact: ["653115908@trueknowledge.com"]])

By calculation (generator: ["moregeneral4@trueknowledge.com"]) I know that:
Fact 2: Judith A. Sprieser is someone who had a significant role in USG Corporation

By calculation (generator: ["moregeneral1@trueknowledge.com"]) I know that:
Fact 2 is true for January 13th 2009 onwards

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 2 is true at June 18th 2013, 23:54:24

I know from locally stored knowledge that:
Fact 6: Judith A. Sprieser is a chief executive officer ([fact: ["702498116@trueknowledge.com"]])

Fact 6 is true at June 18th 2013, 23:54:24 ([unknown object])

I used the following facts to provide this answer:

'is someone who had a significant role in' is a more general form of 'is a company director of'

agree disagree edit

'is someone who had a significant role in' is permanent

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Steven F Leer has been a company director of USG Corporation since at least January 13th 2009

agree disagree edit

Judith A. Sprieser is a chief executive officer is true at June 18th 2013, 23:54:24

agree disagree edit

Judith A. Sprieser has been a company director of USG Corporation since at least January 13th 2009

agree disagree edit