Kevin Costello concentrates his state-wide employment rights, school harassment rights and civil rights practice exclusively on behalf of working people of all economic strata and on behalf of their families. Kevin has been a plaintiffs’ trial lawyer for the entirety of his career. He is the founding partner of Costello & Mains, LLC in Mount Laurel, a full state employment, school rights and civil rights plaintiffs’ law firm.
Kevin is Certified by the Supreme Court as a Civil Trial Attorney – one of only approximately 5% of lawyers who earn this Certification – and was one of the amicus counsel in the Lewis v. Harris equal marriage rights case. He is also the holder of a thirteen year old record for the highest verdict in Cape May County history in the Piersante v. Belvedere Condominium Association matter. He has obtained other multi-million dollar verdicts before juries. He is an officer of the Executive Committee of the Board of Governors of the New Jersey Association for Justice, as well as the Chair for the Employment and Labor section of that body and Chair of the Civil Practice Committee. He is also the Chairman of the “Boardwalk Seminar” and “Meadowlands Seminar” Employment programs and a past Chair of the Camden County Bar Association Labor and Employment Committee. Kevin is also a past Treasurer and Vice Chair of the GLBT Rights section for the New Jersey State Bar Association.
Kevin has also for years served as a faculty member for trial attorney continuing education, lecturing on behalf NJAJ, the New Jersey State Bar Association, the Camden and Burlington County Bar Associations, the NJ Institute for Continuing Legal Education, the Lorman Institute, the National Business Institute and for Garden State Equality. He has also taught extensively in the areas of employment law, civil rights and education civil rights. He has spoken to civic groups, trade groups, public school student bodies and to higher education classes.
He has also testified before Senate and Assembly Committees in support of Employment and Civil Rights legislation.
Kevin has been since 2007 a Board member for the Garden State Equality organization. He is a past member of the New Jersey Supreme Court’s Committee on the Unauthorized Practice of Law.
He has appeared on TV and Radio, both locally and nationally, to discuss employment and civil rights, pending legislation, and cases handled by the firm. He has been published in his field in periodicals, educational materials and treatises.
Kevin has been named a “Champion of Equality” by Garden State Equality and a “Super Lawyer” in one capacity or another for the past nine years running. He has been named a “Top One Hundred Trial Lawyer” by the American Trial Lawyers’ Association and has received a 10-Year “BV Distinguished Peer Rating” by Martindale-Hubble. He has been named a New Jersey Monthly “Top Attorney” in New Jersey for three years running by New Jersey Monthly magazine. He has received recognition as a “Top 100 Litigators in NJ” in 2013 and 2014 by the American Society of Legal Advocates.
Kevin lives in South Jersey with his wife and son.
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Practice Areas
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State: New Jersey
Acquired: 1991
No misconduct found
18000 Horizon Way, Suite 800, Mount Laurel, NJ, 08003
costellomains.comShowing 1 - 5 of 6 client reviews from Avvo
Posted by Devon | September 1, 2022 | Hired Attorney
Kevin Costello and his team, especially Miriam, exceeded all of our expectations. From the initial phone call, Kevin's passion and interest in our case was unwavering. His belief in our cause gave us the momentum and support necessary to fight a long established institution. He did not hesitate to re...
Posted by Kim | April 21, 2020 | Hired Attorney
My time was almost out to file a Labor/Employment claim. I didn’t know where to turn. Fate & faith found us Kevin Costello. His HONESTY was profound. His knowledge, ethics & professionalism while remaining just like another person with me made a difficult issue more endurable. Having had the honor o...
Posted by Lisa Ferrari | July 25, 2016 | Hired Attorney
Kevin Costello so kindly helped me and my disabled daughter at a time we felt so vulnerable. His altruism was so unexpected and refreshing and I cannot thank him enough for all he has done for us. All involved including Drake, Robin and Kevin were true professionals and were attentive and sensitiv...
Posted by Billy Ray | June 12, 2014
Everyone at the office has always been kind and helpful. They didn't give up on my case no matter how BIG the company was that we were up against and no matter how long it was drawn out. Thank you Kevin and your team, Thank you!!
Posted by anonymous | August 7, 2024 | Consulted Attorney
I had a simple task I needed help with. Maybe it was not the type of case they take, but there was no need to be rude, arrogant or dismissive. And what kind of lawyer encourages people not to file a harassment complaint when they have endured a decade of harassment and intimidation? I felt so discour...
"Kevin is simply - phenomenal. His knowledge of employment law issues is superior. He is deservedly well respected by members of the judiciary and legal community. Great person!"
"I endorse this lawyer. He is a top-notch attorney in the area of employment law. I do not hesitate to recommend clients to him."
Discrimination lawyer
Social Security & Disability lawyer
Employment and labor lawyer
2025
Super Lawyer, Super Lawyers
2024
Super Lawyer, Super Lawyers
2023
Super Lawyer, Super Lawyers
2022
Super Lawyer, Super Lawyers
2021
Super Lawyer, Super Lawyers
2020
Super Lawyer, Super Lawyers
2019
Super Lawyer, Super Lawyers
2018
Super Lawyer, Super Lawyers
2017
Super Lawyer, Super Lawyers
2016
Super Lawyer, Super Lawyers
2015
BV Rated, Martindale-Hubbell
2015
Super Lawyer, Thomson Reuters
2014
BV Rated, Martindale-Hubbell
2014
New Jersey Super Lawyer, Thomson Reuters
2014
Super Lawyer, Super Lawyers
2014
Roosevelt Nesmith Civil Rights Award, Southern Burlington County NAACP
2014
Top One Hundred Trial Lawyers, National Trial Lawyers
2013
BV Rated, Martindale-Hubbell
2013
New Jersey Super Lawyer, Thomson Reuters
2013
Super Lawyer, Super Lawyers
2013
Top One Hundred Trial Lawyers, National Trial Lawyers
2012
BV Rated, Martindale-Hubbell
2012
Top 100 Trial Lawyers in America, National Trial Lawyers
2012
New Jersey Super Lawyer, Thomson Reuters
2012
Super Lawyer, Super Lawyers
2011
Top 100 Trial Lawyers in America, National Trial Lawyers
2011
New Jersey Super Lawyer, Thomson Reuters
2011
BV Rated, Martindale-Hubbell
2011
Super Lawyer, Super Lawyers
2010
Super Lawyer, Super Lawyers
2010
BV Rated, Martindale-Hubbell
2010
Top 100 Trial Lawyers in America, National Trial Lawyers
2010
New Jersey Super Lawyer, Thomson Reuters
2009
BV Rated, Martindale-Hubbell
2009
Super Lawyer, Super Lawyers
2009
New Jersey Super Lawyer, Thomson Reuters
2008
Super Lawyer, Super Lawyers
2008
New Jersey Super Lawyer, Thomson Reuters
2007
Super Lawyer, Super Lawyers
2007
New Jersey Super Lawyer, Thomson Reuters
2006
Rising Star, Super Lawyers
2006
Champions of Equality, Garden State Equality
2006
New Jersey Super Lawyer, Thomson Reuters
2006 - Present
Founder and Shareholder, Costello & Mains, LLC
2012 - Present
New Jersey Association for JusticeOfficer
2011 - Present
New Jersey Association for JusticeExecutive Committee
2006 - Present
New Jersey Association for JusticeBoard of Governors
2011 - 2012
New Jersey Supreme Court Committee of the Unauthorized Practice of LawMember, Bench-Bar Civil Practice Committee
2008 - 2009
New Jersey State Bar AssociationVice Chair-GLBT Rights Section
2007 - 2008
Garden State Equality Advocacy OrganizationBoard Member
2007 - 2008
New Jersey State Bar AssociationTreasurer-GLBT Rights Section
2000 - 2006
Camden County Bar AssociationChair-Labor & Employment Committee
1991
JD - Juris Doctor
1988
BA - Bachelor of Arts
2006
2006
2005
