Christopher Greenberg

Corporate Officer/Principal at

Express Services, Inc.

Net worth: 1 M $ as of 2026-08-30

60 year

74 connections

Commercial Services

Consumer Services

Technology Services

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	-

All active positions of Christopher Greenberg

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	-

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Training of Christopher Greenberg

Experiences
Positions held

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Private companies

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Connections

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Members of the board

Executives

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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