![Mark Duff](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Mark Duff
Chief Executive Officer at
PERMA-FIX ENVIRONMENTAL SERVICES, INC.
Net worth: 1 M $ as of 31/05/2026
Profile
Mr. Mark J.
Duff is a President, Chief Executive Officer & Director at Perma-Fix Environmental Services, Inc. and a President & Director at Safety & Ecology Holdings Corp.
He is on the Board of Directors at Perma-Fix Environmental Services, Inc. and Safety & Ecology Holdings Corp.
Mr. Duff was previously employed as a Vice President by Leidos, Inc., a President by Safety & Ecology Corp., and a President by Timios National Corp.
He received his undergraduate degree from The University of Alabama and an MBA from the University of Phoenix.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 11/09/2025 | 134,556 ( 0.72% ) | 1 M $ | 31/05/2026 |
Mark Duff active positions
| Companies | Position | Start |
|---|---|---|
| PERMA-FIX ENVIRONMENTAL SERVICES, INC. | Chief Executive Officer | 08/09/2017 |
Safety & Ecology Holdings Corp.
 Safety & Ecology Holdings Corp. Miscellaneous Commercial ServicesCommercial Services Provides facilities support services | President | - |
Former positions of Mark Duff
| Companies | Position | End |
|---|---|---|
Leidos, Inc.
 Leidos, Inc. Information Technology ServicesTechnology Services Provides cyber operations, digital, integrated system and technology solutions | Corporate Officer/Principal | - |
| HOMELAND SECURITY CAPITAL CORP. | President | - |
Safety & Ecology Corp.
 Safety & Ecology Corp. Miscellaneous Commercial ServicesCommercial Services Provides environmental engineering and contract services | President | - |
Training of Mark Duff
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
11
1st degree connections
7
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 7 |
|---|---|
Leidos, Inc.
Leidos, Inc. Information Technology ServicesTechnology Services Provides cyber operations, digital, integrated system and technology solutions | Technology Services |
Perma-Fix Environmental Services, Inc.
 Perma-Fix Environmental Services, Inc. Environmental ServicesIndustrial Services Provides nuclear and industrial waste management services | Industrial Services |
Timios National Corp.
 Timios National Corp. Real Estate DevelopmentFinance Provides real estate services | Finance |
The University of Alabama
 The University of Alabama Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
University of Phoenix
 University of Phoenix Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Safety & Ecology Corp.
Safety & Ecology Corp. Miscellaneous Commercial ServicesCommercial Services Provides environmental engineering and contract services | Commercial Services |
Safety & Ecology Holdings Corp.
Safety & Ecology Holdings Corp. Miscellaneous Commercial ServicesCommercial Services Provides facilities support services | Commercial Services |
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