John Kostecki: Email & Phone Number

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Deputy Sheriff at Genesee County Sheriff Dept|Oakland Charter Township, Michigan, United States

Position:

Deputy Sheriff at Genesee County Sheriff Dept

Location:

Oakland Charter Township, Michigan, United States

View John Kostecki's Email

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Last updated: 2026-05-01

Updated: 2026-05-01

Found email addresses for John Kostecki:

Business emails:

j***@yahoo.com

Personal emails:

j***@yahoo.com,

j***@hotmail.com,

j***@aol.com,

j***@gmail.com

Found phones for John Kostecki:

+1-323-***-**35,

+1-623-***-**17

A different John Kostecki?

Work Experience

Deputy Sheriff at Genesee County Sheriff Dept

Jan 2023 - Current

Owner at McDonald's Restaurants

Mar 1985 - Current

John Kostecki started working in 1985, then the employee has changed 1 company and 1 job. On average, John Kostecki works for one company for 22 years 4 months.

Their professional focus is Social Media, Social Media Marketing, and Sports Marketing across 3 core areas.

Education

Oakland University

Frequently Asked Questions

What is John Kostecki's email address?

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

What is John Kostecki's phone number?

SignalHire found multiple verified phone numbers for John Kostecki: +1-323-***-**35, and +1-623-***-**17.

How do I contact John Kostecki at Genesee County Sheriff Dept?

You can reach John Kostecki 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 Kostecki's professional background?

They have held roles including Owner at companies such as McDonald's Restaurants. Their education includes Oakland University.

Is John Kostecki's contact information up to date?

Yes. John Kostecki's SignalHire profile was last updated on 1 May 2026, reflecting their current position as Deputy Sheriff at Genesee County Sheriff Dept.

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