About us.

For professionals evaluating new business partnerships, M&A opportunities and business transactions, CS Business Screen is a decision intelligence company that provides peace of mind through comprehensive due diligence investigation reporting for both executives and companies that’s both simple and exhaustive.

What we do,
and who we do it for.


– Business Relationship Screening
– Pre-Investment Due Diligence
– Company Officer Screening
– Customer Due Diligence (CDD)
– Enhanced Due Diligence (EDD)
– Know Your Customer Screening (KYC)
– Anti Money Laundering (AML)
– Mergers and Acquisitions Due Diligence
– Investigative Due Diligence


– Private Equity / VC Firms
– Procurement Executives
– Financial Services Firms
– Brokers and Dealers of Securities
– Dealers in Precious Gems and Metals
– Law Firms
– Compliance Officers

Our story.

A fully licensed private investigation company and provider of national business background screening, CS Business Screen offers decision-making confidence without the complexity. Our founder, Dennis Drellishak Sr, set out to provide comprehensive due diligence reporting that’s effortless to order and simple to interpret, and we’ve done just that every day since 1996.

What our client's have to say.

“I have been working with CS Business Screen for more than 2 years and their services have helped my organization to make very important decisions, allowing us to truly know who we are doing business with. The process is simple, the platform is user friendly and our account executive has always been prompt, courteous, knowledgeable and very professional.”

Anonymous Client in the Precious Metals & Minerals Market

What our client's have to say.

“We’ve worked with CS Business Screen since 2012 for both client on-boarding and HR Screening. They do a thorough job and are proactive in letting us know if there are any court delays. Their on-line system is very easy to use and we’re notified via email as soon as reports are ready. Their staff is professional and knowledgeable and provide exceptional service to our company. We highly recommend CS Business Screen!”

Anonymous Client in the Strategic Consulting Market

Explore Features.

See what sets us apart from the overcomplicated and impossible-to-decipher competition.

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We’ve tailored our service bundles to give you what you need, without paying for what you don’t.

Our Management

Dennis Drellishak Sr. - CEO & Founder

Dennis Drellishak Sr. is recognized as a leading authority in the business information services industry with more than 30+ years of experience in high-level business investigations and pre-employment screenings. Under Dennis’ leadership, Corporate Screening has been named one of the top screening firms in the country six years in a row by HRO Magazine and four times has been voted into the ‘Weatherhead 100’ fastest-growing companies in Northeast Ohio. Dennis has also been licensed as a Private Investigator in Ohio for over 30 years.  

Dennis Drellishak Jr. - President

Dennis Drellishak Jr. is a technologist, entrepreneur and executive.  As the President for CSBusinessScreen.com Dennis provides leadership for a due diligence background check company technology solution.  His focus is providing comprehensive, tailored business background checks by streamlining operations, reducing costs, enabling faster response, increasing productivity and improving security. 

Eugene Claridge - Director of Business Development

Eugene Claridge is Director of Business Development for CSBusinessScreen.com. In this role, Gene oversees business development and outreach, regularly evaluates client programs, and collaborates with clients to build successful screening programs. As a licensed private investigator, Gene takes an analytical approach to building screening services for his customers.  He also reviews client programs and policies to assure compliance to federal laws and other regulations.

Anthony Nolfi - Business Background Investigations Supervisor

Anthony Nolfi is the Business Background Investigations Supervisor for CSBusinessScreen.com. Anthony oversees the day-to-day operations of the business background investigations. As a licensed private investigator, Anthony applies his extensive industry knowledge and public records experience to our investigative processes. His attention to detail and inquisitive nature leads to accurate and high quality results.