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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 300 Stewart Avenue Corporation Mark Achenbach

Mark Achenbach

Highest compensated employee

Chief Operating Officer at 300 Stewart Avenue Corporation

Fiscal year ended December 31, 2024. Published on January 25, 2026.

$227,818
2024

Total compensation

Mark Achenbach has been listed as an employee of 300 Stewart Avenue Corporation in Form 990 filings since fiscal year 2017. Total compensation for Mark Achenbach has increased by 62.9% from 2017 to 2024.

Annual compensation details

$227,818
+6.1%
Chief Operating Officer
2024
$222k org
40 hrs/wk
$7k other
--
$214,776
+9.3%
Chief Operating Officer (Outgoing)
2023
$209k org
40 hrs/wk
$6k other
--

Total compensation by year

Compare the compensation of Mark Achenbach to:

2024

Other employees at 300 Stewart Avenue Corporation

Jonathan Ullman
President and Chief Executive Officer
$577,224
$556,847 from orgNo related comp$20,377 other
Ashley Miller
Vice President of Marketing, PR and Sales
$220,685
$211,561 from orgNo related comp$9,124 other
Geoff Schumacher
Vice President of Exhibits and Programs
$219,748
$208,787 from orgNo related comp$10,961 other
Lisa Belair
Vice President of Finance and Business Analytics
$192,574
$185,995 from orgNo related comp$6,579 other
Ryan Markus
SR Director, Technology and Facilities
$187,806
$174,474 from orgNo related comp$13,332 other
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Revisions to this profile

January 25, 2026:
2024 300 Stewart Avenue Corporation 990 published
January 25, 2026:
2023 300 Stewart Avenue Corporation 990 published
January 25, 2026:
2022 300 Stewart Avenue Corporation 990 published

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