Mark Siebald: Email & Phone Number

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Mainframe System Administrator Apprentice at IBM|Fort Worth, Texas, United States

Position:

Mainframe System Administrator Apprentice at IBM

Location:

Fort Worth, Texas, United States

View Mark Siebald's Email

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Last updated: 2026-07-29

Updated: 2026-07-29

Found email addresses for Mark Siebald:

Business emails:

m**k@nacholand.com,

m**********d@aa.com,

m**********d@marines.mil

Personal emails:

s************3@gmail.com,

t*********s@gmail.com

Found phones for Mark Siebald:

+1-205-***-**25,

+1-909-***-**70,

+1-520-***-**45,

+1-480-***-**03

A different Mark Siebald?

Work Experience 8 years

Mainframe System Administrator Apprentice at IBM

May 2026 - Current

Logistics Manager at United States Marine Corps

Mar 2018 - Current

Information Technology Infrastructure Engineer at American Airlines

May 2022 - Dec 2025

Mark Siebald started working in 2018, then the employee has changed 2 companies and 2 jobs. On average, Mark Siebald works for one company for 4 years 1 month.

Their professional focus is Account Management, AJAX, and Cascading Style Sheets (CSS) across 3 core areas.

Mark holds IBM z/OS Mainframe Practitioner, Introduction to System Programming on IBM Z, and Introduction to z/OS Commands and Panels on IBM Z certifications.

Education

Codeup

Frequently Asked Questions

What is Mark Siebald's email address?

SignalHire found verified email addresses for Mark Siebald, both business and personal. Their business email is m**k@nacholand.com, and personal emails include s************3@gmail.com, and t*********s@gmail.com.

What is Mark Siebald's phone number?

SignalHire found multiple verified phone numbers for Mark Siebald: +1-205-***-**25, +1-909-***-**70, and +1-520-***-**45.

How do I contact Mark Siebald at IBM?

You can reach Mark Siebald 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 Siebald's professional background?

Mark Siebald has 8 years of professional experience. They have held roles including Logistics Manager, and Information Technology Infrastructure Engineer at companies such as United States Marine Corps, and American Airlines. Their education includes Codeup.

Is Mark Siebald's contact information up to date?

Yes. Mark Siebald's SignalHire profile was last updated on 29 July 2026, reflecting their current position as Mainframe System Administrator Apprentice at IBM in Armonk, New York, NY, United States.

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