Jonathan Gackowski: Email & Phone Number

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Law Enforcement Training Instructor at Contra Costa County Office of the Sheriff|Concord, California, United States

Position:

Law Enforcement Training Instructor at Contra Costa County Office of the Sheriff

Location:

Concord, California, United States

View Jonathan Gackowski's Email

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Last updated: 2026-07-03

Updated: 2026-07-03

Found email addresses for Jonathan Gackowski:

Business emails:

j********g@cocosheriff.org

Personal emails:

j***@cocosheriff.org,

g***@post.ca.gov,

j***@yahoo.com

Found phones for Jonathan Gackowski:

+1-323-***-**81,

+1-323-***-**12,

+1-323-***-**40

A different Jonathan Gackowski?

Work Experience 24 years

Law Enforcement Training Instructor at Contra Costa County Office of the Sheriff

May 2025 - Current

Bureau Chief at California Commission on Peace Officer Standards and Training (POST)

Dec 2024 - Apr 2025

Law Enforcement Consultant at California Commission on Peace Officer Standards and Training (POST)

Aug 2024 - Dec 2024

Captain at Contra Costa County Office of the Sheriff

Apr 2002 - Aug 2024

Jonathan Gackowski started working in 2002, then the employee has changed 1 company and 3 jobs. On average, Jonathan Gackowski works for one company for 6 years 1 month.

Their professional focus is Advance Planning, Business Management, and Communication across 3 core areas.

Education

Bachelor of Science - BS at California State University, Hayward

Frequently Asked Questions

What is Jonathan Gackowski's email address?

SignalHire found verified email addresses for Jonathan Gackowski, both business and personal. Their business email is j********g@cocosheriff.org, and personal emails include j***@cocosheriff.org, g***@post.ca.gov, and j***@yahoo.com.

What is Jonathan Gackowski's phone number?

SignalHire found multiple verified phone numbers for Jonathan Gackowski: +1-323-***-**81, +1-323-***-**12, and +1-323-***-**40.

How do I contact Jonathan Gackowski at Contra Costa County Office of the Sheriff?

You can reach Jonathan Gackowski 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 Jonathan Gackowski's professional background?

Jonathan Gackowski has 24 years of professional experience. They have held roles including Bureau Chief, Law Enforcement Consultant, and Captain at companies such as California Commission on Peace Officer Standards and Training (POST), California Commission on Peace Officer Standards and Training (POST), and Contra Costa County Office of the Sheriff. Their education includes Bachelor of Science - BS from California State University, Hayward.

Is Jonathan Gackowski's contact information up to date?

Yes. Jonathan Gackowski's SignalHire profile was last updated on 3 July 2026, reflecting their current position as Law Enforcement Training Instructor at Contra Costa County Office of the Sheriff in Martinez, California, United States.

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