Mark Helderman: Email & Phone Number

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Board Member at ONEOK|Greater Cleveland, United States

Position:

Board Member at ONEOK

Location:

Greater Cleveland, United States

View Mark Helderman's Email

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Last updated: 2025-12-14

Updated: 2025-12-14

Found email addresses for Mark Helderman:

Business emails:

m***********n@oneok.com

Personal emails:

m***@aol.com,

m***@yahoo.com

Found phones for Mark Helderman:

+1-323-***-**90,

+1-623-***-**68,

+1-205-***-**81,

+1-909-***-**90

Prospect analytics

Current work details

Job levelBoard member

DepartmentOil & Energy, Venture Capital & Private Equity

A different Mark Helderman?

Work Experience 29 years

Board Member at ONEOK

Feb 2019 - Current

Private Investor at Agency Investors

Feb 2019 - Current

Retired Managing Dir. & Portfolio Mgr. at Sasco Capital, Inc.

Mar 1997 - Feb 2019

Mark Helderman started working in 1997, then the employee has changed 2 companies and 2 jobs. On average, Mark Helderman works for one company for 12 years 6 months.

Their professional focus is Angel Investor, Asset Allocation, and Business Development across 3 core areas.

Education

MLS at University of Oklahoma

University of Dayton

Frequently Asked Questions

What is Mark Helderman's email address?

SignalHire found verified email addresses for Mark Helderman, both business and personal. Their business email is m***********n@oneok.com, and personal emails include m***@aol.com, and m***@yahoo.com.

What is Mark Helderman's phone number?

SignalHire found multiple verified phone numbers for Mark Helderman: +1-323-***-**90, +1-623-***-**68, and +1-205-***-**81.

How do I contact Mark Helderman at ONEOK?

You can reach Mark Helderman through SignalHire by unlocking their verified email and direct phone number (free signup, no credit card needed). SignalHire is the fastest route if you need their contact details immediately.

What is Mark Helderman's professional background?

Mark Helderman has 29 years of professional experience. They have held roles including Private Investor, and Retired Managing Dir. & Portfolio Mgr. at companies such as Agency Investors, and Sasco Capital, Inc.. Their education includes MLS from University of Oklahoma, and University of Dayton.

Is Mark Helderman's contact information up to date?

Yes. Mark Helderman's SignalHire profile was last updated on 14 December 2025, reflecting their current position as Board Member at ONEOK in Tulsa, OK, United States.

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