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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 Lahey Clinic Foundation Inc. Antoniades Efstathios

Antoniades Efstathios

Former

Former Chief Operating Officer at Lahey Clinic Foundation Inc.

Fiscal year ended September 30, 2023. Published on January 25, 2026.

$387,575
2023

Total compensation

Antoniades Efstathios has been listed as an employee of Lahey Clinic Foundation Inc. in Form 990 filings since fiscal year 2020. Total compensation for Antoniades Efstathios has decreased by 50.1% from 2020 to 2023.

Annual compensation details

$387,575
-47.7%
Former Chief Operating Officer
2023
$213k related
--
$176k other
--
$741,663
+8.9%
Chief Operating Officer
2022
$687k related
40 hrs/wk
$56k other
--

Total compensation by year

Compare the compensation of Antoniades Efstathios to:

2023

Other employees at Lahey Clinic Foundation Inc.

Tabb M.D. Kevin
TTEE (EX Officio) and CEO (Ex-Off)
$2,807,152
$0 from org$2,507,235 from related$299,917 other
Kerndl John
Treas (Ex-Off) (EVP and CFO, Bilh)
$1,335,872
$0 from org$1,301,463 from related$34,409 other
Longworth M.D. David
Trustee (Ex-Officio) and President
$1,142,308
$0 from org$1,110,533 from related$31,775 other
Rios Cindy
Treas (Ex-Off) (Interim CFO, Bilh)
$1,022,982
$0 from org$802,046 from related$220,936 other
Katz Esq Jamie
Clerk (Ex-Officio)
$914,057
$0 from org$898,193 from related$15,864 other
Mourtzinos M.D. Arthur P
Trustee; Urologist
$796,742
$0 from org$748,389 from related$48,353 other
Bennett Kevin
CFO, ASST Treas (Exoff), Interim COO
$687,746
$0 from org$535,200 from related$152,546 other
Liesching M.D. Timothy
Senior Vice President, Chief Medical Officer
$623,586
$0 from org$539,569 from related$84,017 other
Hunter M.D. Alice A
Trustee; Orthopaedic Surgeon
$576,613
$0 from org$513,964 from related$62,649 other
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Revisions to this profile

January 25, 2026:
2023 Lahey Clinic Foundation Inc. 990 published
January 25, 2026:
2022 Lahey Clinic Foundation Inc. 990 published
January 25, 2026:
2021 Lahey Clinic Foundation Inc. 990 published

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-12.4%
Chief Operating Officer
2021
$625k related
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$725k related
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$53k other
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Other people named Antoniades Efstathios

2023
Employee
Antoniades Efstathios
Beth Israel Lahey Health Pharmacy Inc.
$741,663
Employee
Antoniades Efstathios
Lahey Clinic Inc.
$387,575
Employee
Antoniades Efstathios
Lahey Clinic Hospital Inc.
$387,575