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Compensation 990 is an independent service that uses public IRS Form 990 filings as its source data. We clean and standardize this information, but the original filings may contain errors or omissions. Years on this site refer to the organization’s fiscal year end date on the filing.

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Employees California Independent System Operator Corporation Gregory Cook

Gregory Cook

Highest compensated employee

EXEC Director, Market and Infra at California Independent System Operator Corporation

Fiscal year ended December 31, 2022. Published on January 25, 2026.

$478,651
2022

Total compensation

Gregory Cook has been listed as an employee of California Independent System Operator Corporation in Form 990 filings since fiscal year 2020. Total compensation for Gregory Cook has increased by 10.4% from 2020 to 2022.

Annual compensation details

$478,651
+6.3%
EXEC Director, Market and Infra
2022
$397k
40 hrs/wk
$83k
--
$450,195
+3.9%
EXEC Director, Market and Infra
2021
$370k
40 hrs/wk
$81k
--
$433,424
EXEC Director, Market and Infra
2020
$364k
40 hrs/wk
$71k
--

Total compensation by year

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Revisions to this profile

January 25, 2026:
2022 California Independent System Operator Corporation 990 published
January 25, 2026:
2021 California Independent System Operator Corporation 990 published
January 24, 2026:
2020 California Independent System Operator Corporation 990 published

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2022

Other employees at California Independent System Operator Corporation

Elliott Mainzer
President and Chief Executive Officer
$1,567,293
$1,415,890 No related comp$151,403
Mark Rothleder
Senior Vice President and Chief Operating OFF
$1,414,791
$1,219,354 No related comp$195,437
Roger Collanton
Vice President, GEN CNSL and Chief COMP OFF
$964,415
$836,721 No related comp$127,694
Ryan Seghesio
Vice President, CFO and Treasurer
$878,764
$751,376 No related comp$127,388
Neil Millar
Vice President, Infrastructure and OPS PLAN
$856,737
$727,338 No related comp$129,399
Stacey Crowley
Vice President, External Affairs
$828,464
$719,341 No related comp$109,123
Jodi Ziemathis
Vice President, Human Resources
$789,904
$663,678 No related comp$126,226
Anna McKenna
Vice President, Market Policy and Performance
$735,810
$618,396 No related comp$117,414
Khaled Abdul-Rahman
Vice President, PWR Systems and Market TECH
$732,463
$621,542 No related comp$110,921

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