![Christopher Greenberg](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>)
Christopher Greenberg
Corporate Officer/Principal at
Express Services, Inc.
Net worth: 1 M $ as of 2026-08-30
Profile
Christopher Greenberg was the founder of Greenberg Enterprises LLC, founded in 2015, and Global Safety Network, founded in 2002, holding the title of Chief Executive Officer from 2002 to 2021.
Mr. Greenberg is currently the Owner of Express Services, Inc. Former jobs include Chairman at Birchtech Corp.
from 2014 to 2025, Director at The Dental Service Corp.
of North Dakota, and Director at Energy & Environmental Research Center Foundation.
Education includes an undergraduate degree from the University of North Dakota, conferred in 1992.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
BIRCHTECH CORP. 4.13% | 2026-02-25 | 1,086,107 ( 4.13% ) | 1 M $ | 2026-08-30 |
Christopher Greenberg active positions
| Companies | Position | Start |
|---|---|---|
Express Services, Inc.
 Express Services, Inc. Personnel ServicesCommercial Services Provides staffing services and human resource solutions | Corporate Officer/Principal | - |
Former positions of Christopher Greenberg
| Companies | Position | End |
|---|---|---|
| BIRCHTECH CORP. | Chairman | 2025-06-30 |
Global Safety Network
 Global Safety Network Miscellaneous Commercial ServicesCommercial Services Provides background investigation, drug free workplace program and training services | Chief Executive Officer | 2021-04-30 |
Energy & Environmental Research Center Foundation | Director/Board Member | - |
The Dental Service Corp. of North Dakota | Director/Board Member | - |
Training of Christopher Greenberg
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
74
1st degree connections
6
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 6 |
|---|---|
Express Services, Inc.
Express Services, Inc. Personnel ServicesCommercial Services Provides staffing services and human resource solutions | Commercial Services |
University of North Dakota
 University of North Dakota Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Birchtech Corp.
 Birchtech Corp. Packaged SoftwareTechnology Services Develops mercury emission control technologies | Technology Services |
Global Safety Network
Global Safety Network Miscellaneous Commercial ServicesCommercial Services Provides background investigation, drug free workplace program and training services | Commercial Services |
The Dental Service Corp. of North Dakota | |
Energy & Environmental Research Center Foundation |
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- Christopher Greenberg
