She is an Adjunct Associate Professor of Law at American University's Washington College of Law, where she teaches "Employment Law: The Employment Relationship" to upper level law students.

She regularly represents and advises employers in all aspects of employment and civil rights law and litigation. She has conducted numerous jury trials in federal and state courts as sole or lead counsel. Typical matters which she handles include EEO discrimination and retaliation charges, non-competition agreements, employment policies and handbooks, employment contracts, management training, internal investigations of employee complaints, severance agreements, reasonable accommodation issues, whistleblower claims, unpaid wage cases, wrongful discharge claims, long term disability/disability retirement applications, MSPB complaints, First Amendment/Section 1983 cases and common law torts.

Ms. Seltzer is also a mediator affiliated with Creative Dispute Resolutions, LLC (www.creativedisputeresolutions.com). Through Creative Dispute Resolutions, LLC, she mediates employment disputes and assists parties in resolving their issues through alternative dispute resolution and thus avoiding protracted, expensive litigation.

Over the years, Diane Seltzer has worked with many firefighters and police officers to ensure that the government does not interfere with the civil rights of people who seek to ensure public safety. She takes great pleasure in assisting firefighters and police officers in obtaining, or being reinstated to, positions from which they were unlawfully prohibited from holding due to their disabilities, religious beliefs, gender, prior EEO activity, and other protected characteristics.

Unlike many employment lawyers, Diane Seltzer's philosophy is that there are many good employers, and there are many good employees; neither is inherently "bad." She is able to represent both management and employees precisely because she accepts each case on its individual merits, without classifying either group as one whose members she does not wish to represent.

In May 2004, Ms. Seltzer was elected as a member of, the Board of Directors of National Capital Housing Management Corporation, a non-profit organization that provides and promotes affordable fair housing for senior citizens and disabled adults of low to moderate income.

She is an involved leader in national and local bar associations. Some of her leadership activities include:

• Co-Chair, Solo and Small Firm Committee of the American Bar Association's (ABA) Section of Litigation (2008 - present)
• Vice-Chair, Federal Law Clerk Training program, conducted by the American Bar Association's (ABA) Section of Labor and Employment Law (2007 – present).
• Co-Chair, Employment and Labor Relations Committee of the American Bar Association's (ABA) Section of Litigation (2004-2008)
• Co-Chair, American Bar Association (ABA) Section of Litigation, Committee on Employment and Labor's Subcommittee on Equal Employment Opportunity (2000-2004)
• Vice President, Metropolitan Washington Employment Lawyers Association (MWELA) (2000-2002 and 1998-1999)
• Board Member, MWELA (1995-present)
• Newsletter Editor, MWELA (1995-1997)
• Chair, Employment Law Section of the Bar Association of Montgomery County, Maryland (BAMC) (1996-1998), for which she organized, planned and taught monthly educational programs and Continuing Legal Education (CLE) programs
• Member, Bar Association of Montgomery County, Maryland
• Member, District of Columbia Bar's Law Practice Management Section's Steering Committee (1998-2000)
• Co-Chair, Solo and Small Firm Committee of the District of Columbia Bar's Law Practice Management Section's Steering Committee (1999-2000)
• Plaintiffs' Co-Chair of the Regional Liaison Program of the ABA Section of Labor and Employment Law's Committee on Equal Employment Opportunity (1997)
• Past Member, National Employment Lawyers Association, the Maryland State Bar Association and the Bethesda-Chevy Chase Chamber of Commerce.