Sean Callahan - Email & Phone Number

CIO at Sumnerone

Sean Callahan is based out of Kansas City Metropolitan Area and works at Sumnerone as CIO.

Sean Callahan's Contact Information

Sean Callahan's Work email

s*****@sumner***.com

Valid

Latest update

October 11, 2025

Location

Kansas City Metropolitan Area

Sean's current employer

Sumnerone

Description

We're proud to announce the rebrand of Corporate Business Systems to SumnerOne.

Website

sumnerone.com

HQ Location

St. Louis, MO, United States

Number of employees

201-500

Industry

IT Services And IT Consulting

Latest update

April 30, 2024

Read about Sumnerone

Frequent questions about Sean Callahan

What company is Sean Callahan working for?

Sean Callahan works for Sumnerone.

What is Sean Callahan's function at Sumnerone?

Sean Callahan is CIO at Sumnerone.

Where is Sean Callahan based?

Sean Callahan is based out of Kansas City Metropolitan Area.

What is Sean Callahan's work email address?

Sean Callahan's professional email address is s*****@sumner***.com

Who are Sean Callahan's co-workers?

Sean Callahan's colleagues are Kevin Snyder, Odza Shereni, Scott Moellenhoff, Allen Willison, Bruce Smith, Larry Walker, Sarah Skeeters, Kevin Bostian, Edmund Sumner, Carl Little, Kelly Mixon, Liz Sumner, Wayne Rueger, Denise Turner, Robert McCarthy, Randy Stumpf, Karen Schaefer, Samantha Williams, John Kardon, Stacy Sumner, Matt Maholland, Haley Klemencic, Robert Newell, Tony Ryndak, Michelle Morley, Garry Fister, Robyn Gisick, Mark Hartman, Ryan Gorczyca, Nick Spillenkothen, Jeff Sandifer, Rachelle Smith, Leonard Covarrubias, Casey Miller.

Sean's co-workers

Kevin Snyder

President | SumnerOne Southwest Region

Odza Shereni

ImpalaSC Painting and Renovations CEO

Scott Moellenhoff

Vice President of Sales - St. Louis Region

Allen Willison

Vice President of Production Print-East

Bruce Smith

Vice President Production Print

Larry Walker

VP of Service Southwest Region

Sarah Skeeters

Sales Operations Coordinator

Kevin Bostian

Vice President of Sales Oklahoma

Edmund Sumner

Managing Director

Carl Little

Director Of Business Development

Kelly Mixon

Head Of Human Resources

Liz Sumner

Managing Director

Wayne Rueger

Head of Service and Operations

Denise Turner

Director of Human Resources

Robert McCarthy

Lead Analyst Enterprise Production Print

Randy Stumpf

Major Account Manager, Document and Data Solutions

Karen Schaefer

Enterprise Sales Executive

Samantha Williams

Account Manager

John Kardon

Production Systems Consultant

Stacy Sumner

Senior Account Manager

Matt Maholland

Print Production Specialist

Haley Klemencic

Business Development Executive

Robert Newell

Senior Account Manager

Senior Financial Planning and Analysis Manager

Robyn Gisick

Office Administrator/Billing Specialist

Mark Hartman

Area Manager

Ryan Gorczyca

Internal Infrastructure Manager

Nick Spillenkothen

Production Print Specialist

Jeff Sandifer

Sales Manager

Rachelle Smith

HR Business Partner and Fleet Manager

Leonard Covarrubias

Pre-Sales Support Manager

Casey Miller

Solutions Support Specialist

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