Callum O'Brien

Callum O'Brien serves as Chief Executive Officer at CLM. CLM operates in the staffing & recruiting sector with approximately 30.0 employees. The company is headquartered in London, England.

Industry & Role Insights

• • MessageCEO tracks 2,963 executives in the staffing & recruiting sector.
• • We have verified contacts for 2 executives at CLM.
• • 10,137 executive contacts are available in England.
• • Our database includes 201,468 c suite-level executives.

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PD

Pedro Diogenes CTO | Diretor Técnico LATAM at CLM

JC

Joe Coletta CEO at 180 Engineering

RK

Ryan Kevelighan Chief Executive Officer at 1Medical

PU

Prateek Upadhyay Chief Operating Officer at 1 POINT SYSTEM LLC

LH

Larry Hayes Chief Executive Officer at 24HourNurse, LLC

Outreach Guidance — staffing & recruiting Sector

Executives like Callum O'Brien in the staffing & recruiting 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 CLM.

Callum O'Brien's Position in the MessageCEO Database

• •Callum O'Brien is 1 of 2 verified executive contacts we track at CLM.
• •2,902 verified executive contacts in staffing & recruiting are in the MessageCEO database.
• •10,040 verified executive contacts in England are in the database.
• •40 verified contacts work at staffing & recruiting companies in the 30.0 employee range (same size as CLM).

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 We do not publish personal addresses or sensitive identifiers.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 Callum O'Brien directly?

Callum O'Brien's verified email address is available to MessageCEO Pro subscribers. They currently serve as Chief Executive Officer at CLM. Access direct contact info to skip gatekeepers and reach the decision maker.

What company does Callum O'Brien work for?

Callum O'Brien is Chief Executive Officer at CLM, a company in the staffing & recruiting sector with 30.0 employees. The company is based in London, England.

Can I pitch or sell to Callum O'Brien?

As Chief Executive Officer at CLM, Callum O'Brien is a key decision-maker in the staffing & recruiting sector. MessageCEO Pro gives you verified email to reach Callum O'Brien directly — ideal for B2B sales, partnerships, and executive recruiting.

What industry is Callum O'Brien in?

Callum O'Brien works in the staffing & recruiting industry as Chief Executive Officer at CLM. MessageCEO provides verified contact information for executives across all major industries.

Is Callum O'Brien's contact information verified?

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

Last updated: July 31, 2026