Melissa R. Costello counsels and represents private businesses, public corporations, and nonprofit organizations in a variety of litigation and transactional matters. Her practice emphasizes civil employment matters involving harassment, discrimination, wage-and-hour law, state and federal leave laws, ADA, FMLA, COVID-19 issues, discipline issues, contracts, trade secret protection, restrictive covenants, and employment separation.
Melissa has assisted clients in formulating policies, procedures, handbooks, contracts, and strategies to minimize the risk of litigation. She has represented clients in administrative matters, including before the U.S. Department of Labor, U.S. Equal Employment Opportunity Commission, Arizona Attorney General’s Office Civil Rights Division, and Industrial Commission of Arizona.
Melissa has co-chaired jury and bench trials in state and federal court.
Pro Bono Experience
American Bar Association, 2001-Present
Arizona State Bar Association, 2001-Present
Maricopa County Bar Association, 2001-Present
Melissa is a frequent presenter on employment law topics throughout the Arizona business community. Recent presentations include:
“Mental Health Awareness & Avoiding Discrimination Lawsuits,” Ballard Spahr Webinar in conjunction with Paychex HR, April 28, 2021
“Vaccines in the Workplace: What to Do?” Ballard Spahr Webinar in conjunction with Paychex HR, February 17, 2021
"Wellness in the Workplace: Expanding Your Workplace to Include Mental Health," Cancer Support Community of Arizona, August 21, 2020
Board Memberships & Community Service
Cancer Support Community—Board of Directors, 2012-2018; Leadership Council, 2008-2011
Vice Chair, 2015-2016
Governance Chair, 2014-2015
Scottsdale Leadership, 2004-2006
Board of Directors, Recruitment and Selection Vice Chair, 2005-2006
The University of Arizona (J.D., cum laude, 2001)
The University of Arizona (B.A. and B.S., cum laude, 1997)