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Jason advises clients on compliance with Title VII, the Age Discrimination in Employment Act, the Americans with Disabilities Act, the Family and Medical Leave Act, the Fair Labor Standards Act, the WARN Act and similar state and local laws.

He counsels clients on traditional labor law matters arising under the National Labor Relations Act, including the negotiation and interpretation of collective bargaining agreements; drafting and reviewing personnel policies; drafting employment, independent contractor, non-competition, non-solicitation, confidentiality and severance agreements; and I-9 compliance counseling. Jason also counsels clients regarding employment and labor-related issues in connection with mergers and acquisitions (both buyer and seller side).

A significant portion of Jason’s practice is devoted to employment litigation. He defends employers before state and federal administrative agencies and state and federal courts in claims involving discrimination, harassment, retaliation, wrongful discharge, state and federal wage and hour laws and leave of absence laws.

Jason’s litigation practice also includes representing employers in actions to enforce and defend trade secret and non-compete matters, actions that often involve appearing in court to obtain temporary restraining orders and other injunctive relief as to former employees who violate non-compete, non-solicitation and non-disclosure covenants. Jason also has successfully arbitrated numerous grievances on behalf of employers with unionized work forces in cases involving both disciplinary actions and contract interpretation.

Jason has written and spoken on numerous labor and employment issues, including employee leave rights, I-9 compliance and enforcement, drafting enforceable non-compete agreements, wage and hour compliance, hiring practices and NLRB developments.

A member of Calfee's Diversity, Equity, and Inclusion Committee, Jason also serves as Chair of the Calfee Inclusion Network affinity group. 

He is a founding board member and former secretary of the Central Ohio affiliate of the National Asian Pacific American Bar Association.

Jason is a former valedictorian of St. Ignatius High School in Cleveland, Ohio, who, along with his brother Jeff, remain the only set of brothers to have been named valedictorian of St. Ignatius in consecutive years.

Jason previously practiced law at Vorys, Sater, Seymour and Pease LLP before joining Calfee in 2007. 

Honors & Recognitions

  • The Best Lawyers in America©, Labor Law - Management (2022)


J.D., cum laude, The Ohio State University Moritz College of Law, 2003

B.A., University of Pennsylvania, 2000



  • Obtained summary judgment on behalf of national manufacturing client in age and disability discrimination lawsuit before the Lorain County Court of Common Pleas.
  • Obtained summary judgment on behalf of international retail company in hotly contested reverse race discrimination lawsuit in U.S. District Court for the Southern District of Mississippi, Jackson Division.
  • Successfully obtained dismissal of breach of contract, intentional infliction of emotional distress, promissory estoppel, and age discrimination claims on behalf of large paint company in Medina County Court of Common Pleas, after a favorable settlement and dismissal of remaining race discrimination claim was negotiated for nuisance value.
  • Obtained dismissal of sexual harassment and negligent supervision lawsuit brought against franchisee, franchisor, and parent company of franchisor of fast-food restaurants in Cuyahoga County Court of Common Pleas.
  • Successfully represented a national safety helmet manufacturer by commencing litigation against a former employee/engineer with significant knowledge of employer’s confidential designs and technical information to enforce the terms of non-competition and nondisclosure agreement, by obtaining an emergency temporary restraining order and preliminary injunction in Cuyahoga County Court of Common Pleas to prevent former employee from joining a competitor in California. The former employee was made to comply with his post-employment obligations, as the competing employer revoked his offer of employment when faced with the preliminary injunction issued by the Court.
  • Successfully obtained injunctive relief from state and federal courts in Ohio on behalf of international paper packaging company to enforce the terms of non-competition agreements with former sales employees and with former distributor and to prevent former employees and former distributor from working with competitors during non-competition period.
  • Successfully represented national manufacturing client in 11-count action filed in the U.S. District Court for the Southern District of Florida against former employee and new employer after discovering that former employee used her time off while out on medical leave to join a new competing venture and forwarded hundreds of emails containing the company’s confidential designs and business information. The new employer terminated the former employee, returned all company property back to the client, and, during the litigation, eventually decided to shut down its business completely.
  • Successful negotiation of favorable settlement and dismissal of tortious interference and breach of duty of loyalty claims against retail client and its new hire accused by the hire’s former employer of misappropriating confidential business information. Obtaining a favorable settlement was in large part due to the filing of a strong motion for summary judgment on behalf of client and new hire, who was hired to run a new business division to complement and serve the company’s core business in the retail area.
  • Successfully represented large specialty chemicals and materials technology client in various discharge and contract interpretation arbitrations against union.
  • Coordinated and conducted comprehensive audits of a large public universities and large insurance company’s work forces for proper classification of exempt and non-exempt positions from overtime requirements under the Fair Labor Standards Act.
  • Represented large manufacturer of plastic molds in I-9 audit by U.S. Department of Homeland Security and Immigration and Customs Enforcement, successfully avoiding monetary penalties and debarment from federal contracts.
  • Obtained dismissals and “no probable cause” findings in favor of several employers in various discrimination actions before the Ohio Civil Rights Commission and Equal Employment Opportunity Commission.

Professional & Community

Professional & Community

  • National Asian Pacific American Bar Association, Central Ohio affiliate, Founding Board Member and Former Secretary 

Client Feedback

Client Feedback

"The collaboration with John Cernelich and Jason Dejelo has yielded excellent results in our three-year history of working with Calfee, Halter & Griswold. The time and attention to detail in preparing for and facilitating the arbitration process on behalf of our company by John and Jason has provided further confirmation and clarity around historical contract language, which has been in place for decades. This has helped our company continue to operate efficiently and has promoted positive employee engagement with our local union leadership and the workforce. We look forward to continued success in our relationship with Calfee."

– Calfee client, as reported by U.S. News – Best Lawyers® in the 2020 “Best Law Firms” rankings report

News & Events




Licensed In

  • Ohio 

Court Admissions

  • U.S. District Court for the Northern District of Ohio
  • U.S. District Court for the Southern District of Ohio
  • U.S. Court of Appeals for the Sixth Circuit
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