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John Gellert
Chief Executive Officer at
SEACOR MARINE HOLDINGS INC.
Net worth: 12 M $ as of 31/08/2026
Profile
John Matthew Gellert is President, Chief Executive Officer & Director at Seacor Marine Holdings, Inc. since 2017 and has been with the company since 2014.
Holds the position of Vice Chairman at The National Ocean Industries Association.
Serves as Director at Offshore Marine Service Association, International Support Vessel Owners' Association, Seacor Capital (UK) Ltd., Stirling Offshore Ltd., and Dynamic Offshore Drilling Ltd. Acts as Principal at SEACOR Marine LLC and President at SEACOR Marine Foreign Holdings, Inc. Formerly Director at Stirling Shipping Co. Ltd. from 2001 to 2018.
Served as Director at Era Group, Inc. Held the role of Co-Chief Operating Officer at SEACOR Holdings, Inc. from 2015 to 2017.
Completed undergraduate education at Harvard College in 1992.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 14/04/2026 | 1,301,026 ( 4.8% ) | 12 M $ | 31/08/2026 |
John Gellert active positions
| Companies | Position | Start |
|---|---|---|
| SEACOR MARINE HOLDINGS INC. | Chief Executive Officer | 15/12/2014 |
SEACOR Marine LLC
 SEACOR Marine LLC Other TransportationTransportation Operates oil and gas field exploration & marine support vessels | Corporate Officer/Principal | - |
Dynamic Offshore Drilling Ltd.
 Dynamic Offshore Drilling Ltd. Contract DrillingIndustrial Services Provides drilling services | Director/Board Member | - |
International Support Vessel Owners' Association | Director/Board Member | - |
Seacor Capital (UK) Ltd.
 Seacor Capital (UK) Ltd. Financial ConglomeratesFinance Functions as investment holding company | Director/Board Member | - |
Stirling Offshore Ltd.
 Stirling Offshore Ltd. Marine ShippingTransportation Provides sea and coastal freight water transportation services | Director/Board Member | - |
SEACOR Marine Foreign Holdings, Inc.
 SEACOR Marine Foreign Holdings, Inc. Finance/Rental/LeasingFinance Provides loan services | President | - |
Offshore Marine Service Association
 Offshore Marine Service Association Miscellaneous Commercial ServicesCommercial Services Operates as association, which provides offshore marine transportation service | Director/Board Member | - |
The National Ocean Industries Association
 The National Ocean Industries Association Miscellaneous Commercial ServicesCommercial Services The National Ocean Industries Association is a non-profit company based in Washington, DC. | Director/Board Member | - |
Former positions of John Gellert
| Companies | Position | End |
|---|---|---|
| ░░░░░░░░ ░░░░░░░░ ░░░ ░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | ░░░░░░░░░░ |
| ░░░░░░░ ░░░░░ ░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | - |
| ░░░░░░ ░░░░░░░░ ░░░░ | ░░░░░ ░░░░░░░░░ ░░░░░░░ | - |
Training of John Gellert
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
77
1st degree connections
13
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 13 |
|---|---|
SEACOR Holdings, Inc.
 SEACOR Holdings, Inc. Marine ShippingTransportation Operates as a holding company whose subsidiaries provides transportation and logistics services | Transportation |
Stirling Shipping Co. Ltd.
 Stirling Shipping Co. Ltd. Marine ShippingTransportation Provides transportation services to the offshore industries | Transportation |
The National Ocean Industries Association
The National Ocean Industries Association Miscellaneous Commercial ServicesCommercial Services The National Ocean Industries Association is a non-profit company based in Washington, DC. | Commercial Services |
Offshore Marine Service Association
Offshore Marine Service Association Miscellaneous Commercial ServicesCommercial Services Operates as association, which provides offshore marine transportation service | Commercial Services |
International Support Vessel Owners' Association | |
SEACOR Marine LLC
SEACOR Marine LLC Other TransportationTransportation Operates oil and gas field exploration & marine support vessels | Transportation |
Seacor Capital (UK) Ltd.
Seacor Capital (UK) Ltd. Financial ConglomeratesFinance Functions as investment holding company | Finance |
Stirling Offshore Ltd.
Stirling Offshore Ltd. Marine ShippingTransportation Provides sea and coastal freight water transportation services | Transportation |
Era Group, Inc.
 Era Group, Inc. Other TransportationTransportation Provides helicopter transport and related services | Transportation |
Dynamic Offshore Drilling Ltd.
Dynamic Offshore Drilling Ltd. Contract DrillingIndustrial Services Provides drilling services | Industrial Services |
Harvard College
 Harvard College Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Seacor Marine Holdings, Inc.
 Seacor Marine Holdings, Inc. Marine ShippingTransportation Provides time and bareboat charter of vessels and marine cargo handling services | Transportation |
SEACOR Marine Foreign Holdings, Inc.
SEACOR Marine Foreign Holdings, Inc. Finance/Rental/LeasingFinance Provides loan services | Finance |
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