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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 TMT International Observatory LLC Mark Sirota

Mark Sirota

Highest compensated employee

Telescope Ctrls Group Leader at TMT International Observatory LLC

Fiscal year ended December 31, 2020. Published on January 24, 2026.

$313,822
2020

Total compensation

Mark Sirota has been listed as an employee of TMT International Observatory LLC in Form 990 filings since fiscal year 2017. Total compensation for Mark Sirota has increased by 10.2% from 2017 to 2020.

Annual compensation details

$313,822
+2.9%
Telescope Ctrls Group Leader
2020
$247k org
40 hrs/wk
$68k other
--
$305,079
+3.8%
Telescope Ctrls Group Leader
2019
$238k org
40 hrs/wk
$68k other
--

Total compensation by year

Compare the compensation of Mark Sirota to:

2020

Other employees at TMT International Observatory LLC

Gary Sanders
Project Manager
$376,746
$332,759 from orgNo related comp$43,987 other
Fengchuan Liu
Deputy Project Manager
$338,356
$265,401 from orgNo related comp$72,955 other
Christophe Dumas
Observatory Scientist
$324,637
$273,745 from orgNo related comp$50,892 other
Ravinder Bhatia
Associate Project Manager
$323,244
$256,026 from orgNo related comp$67,218 other
Eric Hansen
OPTO Mechanical Engineer
$311,725
$237,020 from orgNo related comp$74,705 other
Benjamin Gallagher
M1 Segment Lead Engineer
$289,156
$233,339 from orgNo related comp$55,817 other
Edward Stone
Executive Director
$276,708
$244,346 from orgNo related comp$32,362 other
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Revisions to this profile

January 24, 2026:
2020 TMT International Observatory LLC 990 published
January 24, 2026:
2019 TMT International Observatory LLC 990 published
January 24, 2026:
2018 TMT International Observatory LLC 990 published

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$293,996
+3.2%
Telescope Ctrls Group Leader
2018
$230k org
40 hrs/wk
$65k other
--
$284,855
Telescope Ctrls Group Leader
2017
$224k org
40 hrs/wk
$62k other
--

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