Jack N. Sibley

Photo of Jack N.  Sibley
303 Peachtree Street, NE
Suite 4000
Atlanta, GA 30308-3243

Jack Sibley is the chairman of the executive committee at Hawkins Parnell Thackston & Young LLP. He previously served on the firm's policy committee (2001 to 2012) and as managing partner (2009 to 2012).

Jack’s practice focuses on commercial and contract litigation, business torts, construction disputes, and high-profile trust and estate litigation. He represents corporations and individuals in complex litigation and arbitration. He has taken numerous trials to verdict and through the appellate process.

Jack has served as local, regional, and national counsel for many prominent national and international corporations, including:

Professional Experience

Patent and Trademark Disputes

Obtained preliminary injunction enjoining false advertising activities by defendant under the Federal Lanham Trademark Act and applicable State statutes in the United States District Court for the Northern District of Georgia. (June 2009) Affirmed by the 11th Circuit Court of Appeals. (2010)

Won an arbitration contract dispute regarding ownership of patent rights. (2006-2007)

Contract Disputes (Business, Construction, Trusts & Estates, Etc.)

Obtained with Ty Brown in construction defect regarding a leaking building a favorable outcome in arbitration resulting in favorable settlement for client, the general contractor, with recovery of a substantial portion of settlement funds from subcontractors. (2010)

Obtained favorable ruling and settlement of complex family trust and estate planning dispute involving family partnership issue in the Fulton County Superior Court. (August 2009)

Resolved through litigation and negotiation contract dispute regarding substantial fee for computer software services involving companies and individuals in Georgia, Arizona, and South Africa. (2008)

Won interlocutory injunction shutting down competing business organized by client’s former employee enforcing non-competition covenants in employment contract. (2008)

Favorable ruling in complex arbitration involving dispute between manufacturer and distributor over a breach of distributorship agreement involving a $26 Million claim. (2008)

Won court order to arbitrate and arbitration ruling for enforcement of settlement after two years of litigation in claim asserting tortious interference with business relations and breach of fiduciary duty by former employees who started new business. (2008)

In Connecticut, through Federal Court and arbitration and settlement obtained recovery of fees paid by client against document management provider. (2006)

Received a favorable ruling in a high-profile estate dispute alleging issues of competence and wrongful taking of assets. Plaintiff (father) won back control of over $10 Million in assets from Defendants (children). (2005)

Obtained a defense verdict in a $105 Million public contract dispute filed by an international transportation company alleging improper award of public contract filed against his clients, which was awarded the contract, and the regional transit authority. (2003)

Favorable settlement in a breach of contract, Fair Business Practice Act and Civil RICO case. Plaintiff (bankruptcy trustee of a cabinet installer) sued Defendant manufacturer for $9 Million. Defense won a summary judgment on the Fair Business Practice Act and Civil RICO claims and then settled the case on favorable terms for the client. (1997)

Won a defense summary judgment against Plaintiff (general contractor) who contracted with a school district to build a high school and then sued Defendant (construction management firm) for $18 Million, alleging negligence which caused Plaintiff to perform work outside the scope of the contract and go out of business. (2004)

Won a favorable ruling in a family estate dispute in which a claim was filed contesting the Last Will and Testament of the head of a global financial services company based on a pre-existing divorce decree. All trust funds were returned to client. (1998)

Product Liability / Toxic Tort

Defense verdict in asbestos claim before jury in Alameda County, California. Plaintiff alleged his mesothelioma was caused by exposure to asbestos while using defendant’s products. (2007)

Defense verdict in asbestos claim before jury in Dallas County, Texas. Plaintiff claimed his cancer was caused by exposure to asbestos while using defendant’s products.(2007)

Favorable settlement and award of an arbitration matter of a construction defect claim involving a major college institution. The Petitioner (college) brought a multi-million dollar arbitration case against a joint venture between two general contractors for allegedly defective construction of the college’s administration building. The Firm represented the general contractors and negotiated significant financial contribution from three subcontractors, then during the arbitration hearing settled the college’s claim against the general contractors for less than one third of the claim amount, then continued the arbitration for the general contracts against a subcontractor for indemnification and obtained a significant award in favor of the general contracts. (2007)

Won a defense verdict in a $5 Million claim filed by Plaintiff (manufacturing company) alleging Defendant’s (national paint manufacturer) product was defective by failing to adhere properly to plaintiff’s tire racks. (2002)

Professional affiliations

Community involvement



"Alternative Dispute Resolution: Making the System Work for You," Panel Chair, ALFA International Client Seminar (March 2008)

Trained over 30 local counsel, National Counsel (February 2007 and March 2009)

"Liability of Trust Officer," Annual State Bar Trust & Estates Seminar (July 2006)

"Preparing for Litigation: Early Discovery Problems," Construction Management Association of America (September 2005)

Articles and publications


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Practice areas


J.D., University of Georgia School of Law (1975)

B.A., University of Virginia (1970)

Bar admissions