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Jeff OlsonLicensed

Name: Jeff Olson
Address: Downers Grove, IL

Licensed radon professional based in Downers Grove, DuPage County, IL

Company	Gallagher Bassett Technical Services
License number	RNI20232098
License type	Radon Measurement Professional
License status	Active, IEMA-OHS licensed
Based in	Downers Grove, DuPage County, Illinois

"Based in" is the city and county of the address on the business's license record. That can be a mailing address; it doesn't tell you where the business works.

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How to verify this license

We publish the license details exactly as they appear in the official licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #RNI20232098 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Checked against IEMA-OHS radon license index, last checked 2026-11-02. See the issuing agency.

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