Board Member
Current
Feb 2019 - Present
AeroLeads people directory · profile
Mark Helderman Email & Phone Number
Board Member
at
ONEOK
2 work emails found
@oneok.com
1 phone found area 203
LinkedIn matched
✓ Verified August 2026
4 data sources
Profile completeness 100%
Current company
Role
Board Member
Location
Greater Cleveland, United States
Company size
Who is Mark Helderman? Overview
A concise factual answer block for searchers comparing this professional profile.
Quick answer
Mark Helderman is listed as Board Member at ONEOK, a with 6290 employees, based in Greater Cleveland, United States. AeroLeads shows a work email signal at oneok.com, phone signal with area code 203, and a matched LinkedIn profile for Mark Helderman.
Mark Helderman previously worked as Private Investor at Private Investor and Retired Managing Dir. & Portfolio Mgr. at Sasco Capital, Inc.. Mark Helderman studied at University Of Dayton.
Company email context
Email format at ONEOK
This section adds company-level context without repeating Mark Helderman's masked contact details.
{first}.{last}@oneok.com
92% confidence
AeroLeads found 2 current-domain work email signals for Mark Helderman. Compare company email patterns before reaching out.
Profile bio
About Mark Helderman
Retired After 30 yrs in the US Equities Mkt, Including 20+ yrs Focused on Turnarounds, Restructurings, and Corporate Transformations.Developed Deep Appreciation for Company Vision and Value Creation Philosophy, w/ Focus on Building Long Term Sustainable Value. Passion for Investing with Mgmt Teams that Recognize the Importance of Culture, Talent Mgmt, and Sound Corporate Governance.
Listed skills include Investment Management, Company Valuation, Business Strategy, Capital Markets, and 21 others.
Current workplace
Mark Helderman's current company
Company context helps verify the profile and gives searchers a useful next step.
Oneok
3 roles
Mark Helderman work experience
A career timeline built from the work history available for this profile.
Private Investor
Private Investor
Retired Managing Dir. & Portfolio Mgr.
Mar 1997 - Feb 2019
Team & coworkers
Colleagues at ONEOK
Other employees you can reach at oneok.com. View company contacts for 6290 employees →
BK
Baucom Kim
Colleague at OneokWebbers Falls, Oklahoma, United States
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MT
Mike Turner
Colleague at OneokOologah, Oklahoma, United States
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SM
Sean Mcdonald
Colleague at OneokHouston, Texas, United States
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BS
Brandon Starkey
Colleague at OneokTulsa Metropolitan Area, United States
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RH
Richard Heitman
Colleague at OneokFarmington, Minnesota, United States
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ER
Elias Ramirez
Colleague at OneokMexico
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MF
Marc Faulkner
Colleague at OneokBroken Arrow, Oklahoma, United States
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JG
Jay Ghosn
Colleague at OneokTulsa, Oklahoma, United States
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MB
Mack Blackford
Colleague at OneokTulsa, Oklahoma, United States
View →
RV
Richard Van Horn
Colleague at OneokGalena Park, Texas, United States
View →
Baucom Kim
Colleague at OneokWebbers Falls, Oklahoma, United States
View →
MT
Mike Turner
Colleague at OneokOologah, Oklahoma, United States
View →
SM
Sean Mcdonald
Colleague at OneokHouston, Texas, United States
View →
BS
Brandon Starkey
Colleague at OneokTulsa Metropolitan Area, United States
View →
RH
Richard Heitman
Colleague at OneokFarmington, Minnesota, United States
View →
ER
Elias Ramirez
Colleague at OneokMexico
View →
MF
Marc Faulkner
Colleague at OneokBroken Arrow, Oklahoma, United States
View →
JG
Jay Ghosn
Colleague at OneokTulsa, Oklahoma, United States
View →
MB
Mack Blackford
Colleague at OneokTulsa, Oklahoma, United States
View →
RV
Richard Van Horn
Colleague at OneokGalena Park, Texas, United States
View →
1 education record
Mark Helderman education
FAQ
Frequently asked questions about Mark Helderman
Quick answers generated from the profile data available on this page.
What company does Mark Helderman work for?
Mark Helderman works for ONEOK.
What is Mark Helderman's role at ONEOK?
Mark Helderman is listed as Board Member at ONEOK.
What is Mark Helderman's email address?
AeroLeads has found 2 work email signals at @oneok.com for Mark Helderman at ONEOK.
What is Mark Helderman's phone number?
AeroLeads has found 1 phone signal(s) with area code 203 for Mark Helderman at ONEOK.
Where is Mark Helderman based?
Mark Helderman is based in Greater Cleveland, United States while working with ONEOK.
What companies has Mark Helderman worked for?
Mark Helderman has worked for Oneok, Private Investor, and Sasco Capital, Inc..
Who are Mark Helderman's colleagues at ONEOK?
Mark Helderman's colleagues at ONEOK include Baucom Kim, Mike Turner, Sean Mcdonald, Brandon Starkey, and Richard Heitman.
How can I contact Mark Helderman?
You can use AeroLeads to view verified contact signals for Mark Helderman at ONEOK, including work email, phone, and LinkedIn data when available.
What schools did Mark Helderman attend?
Mark Helderman studied at University Of Dayton.
What skills is Mark Helderman known for?
Mark Helderman is listed with skills including Investment Management, Company Valuation, Business Strategy, Capital Markets, Market Research, Competitive Analysis, Portfolio Management, and Risk Management.
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