Michael Costelli: Email & Phone Number

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Senior Cybersecurity at AT&T Services, Inc|Madison, Connecticut, United States

Position:

Senior Cybersecurity at AT&T Services, Inc

Location:

Madison, Connecticut, United States

View Michael Costelli's Email

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Last updated: 2026-07-08

Updated: 2026-07-08

Found email addresses for Michael Costelli:

Business emails:

c***@hotmail.com

Personal emails:

m*************i@gmail.com

Found phones for Michael Costelli:

+1-480-***-**10,

+1-323-***-**17,

+1-520-***-**04,

+1-623-***-**08

A different Michael Costelli?

Work Experience 19 years

Senior Cybersecurity at AT&T Services, Inc

Senior - Cybersecurity at AT&T Services, Inc.

Apr 2020 - May 2024

Senior – Technology Security at AT&T Services, Inc.

Jan 2018 - Apr 2020

Senior Technical Architect at AT&T Services, Inc.

Jan 2016 - Jan 2018

Professional Technical Architect at AT&T Services, Inc.

Dec 2010 - Jan 2016

Senior IT Analyst at AT&T Services, Inc.

Dec 2005 - Dec 2010

Their professional focus is .NET APIs, Accountability, and Agile & Waterfall Methodologies across 3 core areas.

Education

Bachelor of Arts - BA at University of Connecticut

Master of Business Administration - MBA at University of New Haven

Bachelor of Arts at University of Connecticut, Storrs

Master of Business Administration at University of New Haven

Frequently Asked Questions

What is Michael Costelli's email address?

SignalHire found verified email addresses for Michael Costelli, both business and personal. Their business email is c***@hotmail.com, and personal emails include m*************i@gmail.com.

What is Michael Costelli's phone number?

SignalHire found multiple verified phone numbers for Michael Costelli: +1-480-***-**10, +1-323-***-**17, and +1-520-***-**04.

How do I contact Michael Costelli at AT&T Services, Inc?

You can reach Michael Costelli 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 Michael Costelli's professional background?

Michael Costelli has 19 years of professional experience. They have held roles including Senior - Cybersecurity, Senior – Technology Security, and Senior Technical Architect at companies such as AT&T Services, Inc., AT&T Services, Inc., and AT&T Services, Inc.. Their education includes Bachelor of Arts - BA from University of Connecticut, and Master of Business Administration - MBA from University of New Haven.

Is Michael Costelli's contact information up to date?

Yes. Michael Costelli's SignalHire profile was last updated on 8 July 2026, reflecting their current position as Senior Cybersecurity at AT&T Services, Inc.

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