John Leiseboer

John Leiseboer serves as Chief Technology Officer at QuintessenceLabs. QuintessenceLabs operates in the computer & network security sector with approximately 43.0 employees. The company is headquartered in Tarraganda, New South Wales. QuintessenceLabs generates annual revenue of 12000000.0. To date, QuintessenceLabs has raised 21117300.0 in total funding, with the most recent round being Venture (Round not Specified).

Industry & Role Insights

• • MessageCEO tracks 1,629 executives in the computer & network security sector.
• • 3,176 executive contacts are available in New South Wales.
• • Our database includes 201,469 c suite-level executives.

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Outreach Guidance — computer & network security Sector

Executives like John Leiseboer in the computer & network security sector receive targeted outreach from sales teams, recruiters, and investors. To stand out, personalize your message with industry-specific context and a clear, specific value proposition relevant to their role at QuintessenceLabs.

John Leiseboer's Position in the MessageCEO Database

• •John Leiseboer is 1 of 1 verified executive contact we track at QuintessenceLabs.
• •1,615 verified executive contacts in computer & network security are in the MessageCEO database.
• •3,103 verified executive contacts in New South Wales are in the database.
• •21 verified contacts work at computer & network security companies in the 43.0 employee range (same size as QuintessenceLabs).

Executive contact data compiled from public business filings, LinkedIn public profiles, company press materials, and verified outbound email testing. We do not publish personal addresses or sensitive identifiers. Methodology & sources · Removal requests handled at /remove-info · Updated July 2026.

How do I reach John Leiseboer directly?

John Leiseboer's verified email address is available to MessageCEO Pro subscribers. They currently serve as Chief Technology Officer at QuintessenceLabs. Access direct contact info to skip gatekeepers and reach the decision maker.

What company does John Leiseboer work for?

John Leiseboer is Chief Technology Officer at QuintessenceLabs, a company in the computer & network security sector with 43.0 employees. The company is based in Tarraganda, New South Wales.

Can I pitch or sell to John Leiseboer?

As Chief Technology Officer at QuintessenceLabs, John Leiseboer is a key decision-maker in the computer & network security sector. MessageCEO Pro gives you verified email to reach John Leiseboer directly — ideal for B2B sales, partnerships, and executive recruiting.

What industry is John Leiseboer in?

John Leiseboer works in the computer & network security industry as Chief Technology Officer at QuintessenceLabs. MessageCEO provides verified contact information for executives across all major industries.

Is John Leiseboer's contact information verified?

Yes. MessageCEO verifies executive contact information through multiple data sources and regular validation checks. John Leiseboer's profile is kept up-to-date with the latest available information.

Last updated: July 22, 2026