John Ko: Email & Phone Number

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Sr Supply Chain Planning Manager at T-Mobile|Plano, Texas, United States

Position:

Sr Supply Chain Planning Manager at T-Mobile

Location:

Plano, Texas, United States

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Last updated: 2026-07-20

Updated: 2026-07-20

Found email addresses for John Ko:

Business emails:

j****k@samsung.com,

j*****o@assurant.com

Personal emails:

j***@yahoo.com,

k***@aol.com,

k***@samsung.com,

k***@gmail.com

Found phones for John Ko:

+1-623-***-**07,

+1-623-***-**33

A different John Ko?

Work Experience 14 years

Sr Supply Chain Planning Manager at T-Mobile

Jan 2026 - Current

Demand Planner at Assurant

Aug 2024 - Dec 2025

Planning Analyst III at Samsung Electronics America

Feb 2019 - Dec 2021

Planning Analyst II at Samsung Electronics America

Jan 2017 - Feb 2019

Planning Analyst at Samsung Electronics America

May 2012 - Jan 2017

John Ko started working in 2012, then the employee has changed 2 companies and 4 jobs. On average, John Ko works for one company for 2 years 4 months.

Their professional focus is Analytical Skills, Business Analysis, and Business Planning across 3 core areas.

Education

Bachelor of Arts - BA at Cornell University

Frequently Asked Questions

What is John Ko's email address?

SignalHire found verified email addresses for John Ko, both business and personal. Their business email is j****k@samsung.com, and personal emails include j***@yahoo.com, k***@aol.com, and k***@samsung.com.

What is John Ko's phone number?

SignalHire found multiple verified phone numbers for John Ko: +1-623-***-**07, and +1-623-***-**33.

How do I contact John Ko at T-Mobile?

You can reach John Ko 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 John Ko's professional background?

John Ko has 14 years of professional experience. They have held roles including Demand Planner, Planning Analyst III, and Planning Analyst II at companies such as Assurant, Samsung Electronics America, and Samsung Electronics America. Their education includes Bachelor of Arts - BA from Cornell University.

Is John Ko's contact information up to date?

Yes. John Ko's SignalHire profile was last updated on 20 July 2026, reflecting their current position as Sr Supply Chain Planning Manager at T-Mobile in Bellevue, WA, United States.

John Ko Namesakes

Name

Company

Position

John Ko

Hardy henry group

Finance Manager

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John Ko

NYU KISO

Student Mentor

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John Ko

ahnko

Founder & CEO

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