David P. Zambito

Chair, Utility & Energy

David is chair of the firm's Utility & Energy Practice Group and focuses his work on regulatory, commercial, and development issues involving utilities. He has dedicated his career to defending private enterprise against governmental overreach.

David practices before state and federal regulatory agencies, representing clients in the energy (natural gas and electricity), water, wastewater, telecommunications, and transportation industries. He is experienced in base rate, certificate of public convenience, purchased gas cost, steam cost, distribution system improvement charge, electric and natural gas supplier licensing, formal complaint, safety investigation, securities registration, management audit, affiliated interest, rulemaking, policy-making, and tariff proceedings before the PA Public Utility Commission. He has successfully handled approvals of mergers and acquisitions of regulated public utilities, including acquisitions by equity funds, and has helped to defend utilities against a hostile takeover attempt. He has also represented clients in disputes between regulated public utilities and municipal authorities, and has assisted developers and large institutional clients (such as universities and health systems) in negotiating utility contracts. 

David serves as the Office Managing Partner of the firm's Harrisburg Office. He has also served on the firm's Management Committee, Shareholder Nominating Committee (Co-Chairing for two years), and Marketing Committee.

From 2001 to 2004, David served as counsel to the former chairman of the Pennsylvania Public Utility Commission Glen R. Thomas. Prior to state service, he served three years as a captain in the U.S. Army Judge Advocate General's Corps. While in the Army, he practiced as a courts-martial prosecutor and a special assistant U.S. attorney for the Western District of Kentucky.

David has been designated a Super Lawyers "Rising Star" from 2005 through 2008. In 2005, the Central Penn Business Journal named him one of Central Pennsylvania's "Forty Under 40," and in 2004, The Legal Intelligencer named him a "Lawyer on the Fast Track." In 2002, he was commissioned by Pennsylvania Governor Mark Schweiker as a member of the Pennsylvania Homeland Security Council. In 2008, he served as a member of the Pennsylvania Governor's Sustainable Water Infrastructure Task Force, Legislative/Regulatory Work Group. In 2007, he served on the York County, Pa., Commissioners' Transition Team.

He is an active participant on the Pennsylvania Public Utility Commission's Procedural Rules Committee and serves as a faculty planner for the Pennsylvania Bar Institute's Public Utility Law Conference. He is a member of the American Legion Post No. 799 in York, Pennsylvania. 

David received his bachelor's degree from Grove City College, graduating magna cum laude. He earned his J.D., from The Dickinson School of Law.  He was a member of the Dickinson Law Review and on the Appellate Moot Court Board. 



Michael Klein and David Zambito Recognized Among City & State Pennsylvania’s Energy and Environment Power 100

August 28, 2023

Michael D. Klein and David P. Zambito, members of Cozen O’Connor’s Utility & Energy Practice, have been named to City & State Pennsylvania’s Energy & Environment Power 100 list.

Best Lawyers Honors More Than 200 Cozen O'Connor Attorneys to its Best Lawyers in America 2024 Edition

August 17, 2023

Best Lawyers selected 232 Cozen O’Connor lawyers from 24 of the firm’s U.S. offices for inclusion in the 2024 edition of The Best Lawyers in America.

More Than 200 Cozen O’Connor Attorneys Named Best Lawyers and Ones to Watch

August 22, 2022

210 Cozen O’Connor lawyers from 24 of the firm’s nationwide offices for inclusion in the 2023 edition of The Best Lawyers in America.

Cozen O’Connor Announces Changes to Firm Management 2022

March 23, 2022

Cozen O’Connor is pleased to announce the following changes in firm leadership positions for the 2022 year.

How Governors Races May Change Energy, From EVs To Renewables

February 08, 2022

David Zambito was quoted in an article published in Environment and Energy News (E&E News) that discusses the fate of energy policies based on the potential outcomes of the gubernatorial elections in November 2022. The article looks at the upcoming races of four key states that can transform the energy sector: Pennsylvania, Arizona, Georgia, and Florida.


Pennsylvania Public Utility Commission to Require Diversity Reporting

April 25, 2022

The Pennsylvania Public Utility Commission will be requiring major jurisdictional public utilities to file annual diversity reports beginning March 2023.

Continuing the “Return to Normalcy” at the Pennsylvania Public Utility Commission [Alert]

July 19, 2021

David P. Zambito and Jonathan P. Nase discuss the PUC's various orders gradually ending the emergency measures it took in response to the COVID-19 pandemic.

Pennsylvania Public Utility Commission Enters a New Phase in Responding to the COVID-19 Pandemic [Alert]

March 15, 2021

David P. Zambito and Jonathan P. Nase discuss the additional steps toward returning to pre-COVID-19 pandemic procedures for collecting amounts due for public utility service in Pennsylvania.

Marijuana Legalization Push May Impact PA Utilities’ Zero Tolerance Policies [Alert]

February 26, 2021

David P. Zambito and Vincent Candiello discuss how Pennsylvania’s regulated public utilities would be impacted by the legalization of marijuana and if they are not permitted to continue their zero-tolerance drug use policies for employees involved in the operation of critical infrastructure.

Pennsylvania Public Utility Commission Enters Phase 2 of the Moratorium on Utility Shut-Offs [Alert]

October 19, 2020

David P. Zambito and Jonathan P. Nase discuss Chairman Gladys Brown Dutrieuille's modifications to the emergency order.

The Saga Continues: Pennsylvania PUC Delays Action on Terminating the Moratorium on Utility Shut-offs [Alert]

August 28, 2020

David P. Zambito and Jonathan P. Nase discuss the PUC's postponement of its motion addressing termination of the moratorium so the commission would have more time to evaluate comments that had been filed with the PUC.

Pennsylvania PUC Remains Deadlocked over Terminating the Moratorium on Utility Shut-offs [Alert]

July 20, 2020

David P. Zambito and Jonathan P. Nase discuss the Pennsylvania Public Utility Commission vote on party lines to maintain its moratorium on utility terminations while Governor Tom Wolf’s Proclamation of Disaster Emergency on COVID-19 remains in effect.

In Party-Line Vote, the Pennsylvania PUC Continues the Moratorium on Utility Terminations [Alert]

June 22, 2020

David P. Zambito and Jonathan P. Nase discuss the history and the next steps for Pennsylvania's moratorium on utility terminations.

COVID-19 Emergency Mandates on Utility Construction Activities and Supplies

April 07, 2020

Dave Zambito, Michael Klein, Michael Connolly, and Jonathan Nase explain what utility companies need to know about their construction projects in Pennsylvania and New Jersey.

COVID-19 and the Utility, Energy, Telecommunications & Transportation Sectors: What [Alert]

March 24, 2020

David Zambito, Michael Klein, Michael Connolly, Gregory Eisenstark, Ira Megdal, and Jonathan Nase discuss the executive orders in New Jersey and Pennsylvania impacting the utility industry.


  • Dickinson School of Law, J.D., 1997
  • Grove City College, B.A., magna cum laude, 1994

Awards & Honors

Best Lawyers in America, 2023-2024

Energy & Environment Power 100, City & State Pennsylvania, 2023

Rising Star, Super Lawyers, 2005-2008

Forty Under 40, Central Penn Business Journal, 2005

Lawyer on the Fast Track, Legal Intelligencer, 2004

U.S. Army, Honorable Discharge, 2001

U.S. Army Commendation Medal, 2000

U.S. Army Instructor Badge, 1999

U.S. Army Parachutist Badge, 1998

Commandant's List, U.S. Army Judge Advocate General's School, 1998

  • Pennsylvania
  • Pennsylvania Supreme Court
  • U.S. District Court -- Middle District of Pennsylvania
  • Pennsylvania Bar Association - Public Utility Law Section
  • Energy Association of Pennsylvania - Affiliate Member
  • Order Sons of Italy in America - Grand Lodge of Pennsylvania
  • The American Legion