Our Team

Amy Oppenheimer

Amy Oppenheimer, AWI-CH

Amy Oppenheimer has over 30 years of experience in employment law, as an attorney, investigator, arbitrator, mediator, and trainer for a large range of employers and employees - public and private, large and small - throughout the country.  She is also a retired administrative law judge. Her areas of expertise include preventing workplace harassment and responding to allegations of harassment, investigating workplace harassment, discrimination, retaliation, whistleblower claims, diversity in the workplace, how unconscious bias impacts decision-making and other forms of workplace misconduct. Amy frequently does public speaking on these issues.

A trial qualified expert in State and Federal court, Amy has testified for both the plaintiff and the defense about employment practices in preventing, responding to and investigating workplace harassment. 

Amy is also the author of numerous articles about harassment and discrimination, and is the co-author of Investigating Workplace Harassment, How to be Fair, Thorough and Legal (Society of Human Resource Management, 2003), one of the few books about the practice of investigations.

Amy is also the founder and past President of the Board of the Association of Workplace Investigators, Inc. (AWI). She is also the former Chair of the Executive Committee of the Labor and Employment Section of the State Bar of California and serves as an advisor to that committee. Amy is the former President of the Board of the Berkeley Dispute Resolution Services. Amy has received certificates from the Association of Title IX Administrators (ATIXA) and T9 Mastered to conduct Title IX investigations.

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Amy's CV

Call Amy at: (510) 393-4212

Lisa A. Brewer

Lisa A. Brewer, AWI-CH

Lisa A. Brewer is an attorney with years of experience providing sound legal and business advice for Fortune 500 companies and global law firms. For over a decade, Lisa served as General Counsel for Orrick, Herrington & Sutcliffe and for Brobeck, Phleger & Harrison, where she was responsible for employment matters, internal investigations, policy development, litigation management, insurance and risk management, and transactions.  She advised and coached attorneys and staff globally on matters ranging from workplace and employee relations issues to professional responsibility, career development, and client relationships.

Lisa also served in a senior legal role at Apple, where she advised on matters of trade regulation, employment and human resources, consumer products, advertising, business development, and strategic supply relationships.

Lisa’s international experience includes living in Tokyo, Japan, where she developed a consulting and coaching practice, formulating and conducting management and negotiation training workshops for managers at companies such as Disney, Sony, Mitsubishi Electric, NTT DoCoMo, Japan Bank International, and Hakuhodo.

Lisa received her JD degree from the University of California, Hastings College of the Law, and her BA in journalism, summa cum laude, from San Francisco State University. She is a sustaining member of the Association of Workplace Investigators.

Lisa focuses her current practice on workplace investigations, human resources issues, and employee relations.

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Call Lisa at: (415) 655-1072

Alezah Trigueros

Alezah Trigueros, AWI-CH

Alezah Trigueros is an attorney who has been conducting impartial workplace investigations with the Law Offices of Amy Oppenheimer since 2014. She received her Juris Doctor from the Indiana University Maurer School of Law and her Bachelor's degree in history from the University of California, Santa Cruz.

Her prior legal work includes working as a Law Clerk and Decision Writer for the Social Security Administration Office of Disability Adjudication and Review where she made preliminary disability determinations for applicants appealing their benefit denials by conducting investigations.

Alezah also served as an editor for the Indiana Journal of Global Legal Studies, and worked at the U.S. Department of Energy Office for Labor and Pension Law where she put in place a system that enabled the attorneys in her office to provide quick, consistent responses to employment law inquiries.

Alezah is a sustaining member of the Association of Workplace Investigators (AWI), completed AWI's Training Institute for Workplace Investigators in 2015, and is an AWI Certificate Holder (AWI-CH). Alezah has also received certificates from the Association of Title IX Administrators (ATIXA) and T9 Mastered to conduct Title IX investigations.

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Call Alezah at: (925) 330-0526

Zaneta Butscher Seidel

Zaneta Butscher Seidel, AWI-CH

Zaneta Butscher Seidel is an associate attorney with the Law Offices of Amy Oppenheimer.  She conducts impartial investigations of employment complaints of alleged harassment, discrimination, retaliation, bullying and other workplace misconduct.

Zaneta began her legal career as a litigation associate in the New York office of Baker & McKenzie LLP, where she handled complex commercial litigation and international arbitration matters.  After relocating home to the San Francisco Bay Area, Zaneta associated with a boutique litigation law firm in San Francisco, where for five years she advised and represented clients in complex civil litigation matters involving corporate disputes, data breach, franchise law, unfair competition, personal injury claims, environmental claims and Proposition 65 claims.

Zaneta earned her Bachelor's degree from the University of California, Los Angeles in 2003 and her JD from Columbia University School of Law in 2008.  While at Columbia Law School, Zaneta served as staff editor for the Columbia Human Rights Law Review and interned with the United Nations High Commissioner for Refugees in Geneva, Switzerland.  

Zaneta is a member of the California and New York state bars, a sustaining member of AWI, a graduate of the AWI's Training Institute for Workplace Investigators, and an AWI Certificate Holder (AWI-CH).

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David Stallard

David Stallard

Dave Stallard received his Juris Doctor from UC Davis School of Law in 2004, and his Bachelor of Arts from the University of Colorado at Boulder.  At the Law Offices of Amy Oppenheimer, Dave conducts impartial investigations for public and private sector employers.  Prior to joining the Law Offices of Amy Oppenheimer, Dave worked at a Silicon Valley tech startup and small and medium sized law firms.  Dave worked on contracts, corporate transactions, corporate compliance, and due diligence, and later transitions to workplace investigations.

Dave is a member of the Association of Workplace Investigators (AWI) and completed the AWI Training Institute for Workplace Investigators. He is a member of the California Bar Association. 

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Ann Spivack

Ann Spivack, AWI-CH

Ann Spivack provides support for workplace investigations at the Law Offices of Amy Oppenheimer by writing and editing reports.  

Ann was formerly an editor for McGraw-Hill and a writer and editor for the San Francisco Medical Research Institute (currently CPMC Research Institute). She has also worked for the San Francisco Chronicle, co-authored eight books, and won a James Beard Award for The Essence of Chocolate. She has been a volunteer for the American Himalayan Foundation and San Francisco Suicide Prevention.

Other Professionals We Partner With

Adele Grunberg

Adele Grunberg

Adele Grunberg is a meditator, workplace investigator, and retired Administrative Law Judge with the California Unemployment Appeals Board. Prior to becoming an Administrative Law Judge, she was a trial lawyer for 13 years with the California Department of Transportation specializing in Government Tort, Property, and Landlord/Tenant Law.

For the last 15 years, Adele has been a Mediator specializing in workplace mediations and communications skills. She has also investigated claims of harassment and discrimination in the workplace and arbitrated for the International Commission on Holocaust Era Insurance Claims. She has served as a volunteer mentor for parolees in the State Bar Volunteers in Parole program.

Adele graduated with a BA from Boston University in 1971, a JD degree from Golden Gate University in 1977, an MA in Psychology and a Certificate in Conflict Resolution from the John F Kennedy Graduate School of Psychology in 2000.

Kenneth Hawkins

Kenneth Hawkins

Kenneth Hawkins has been mediating disputes, training mediators, and working with organizations and individuals in the area of organizational development and conflict resolution for over 25 years and has provided consultation and training to establish over 350 dispute resolution programs throughout the United States, Canada, and Europe. Ken was the Director of Training at San Francisco’s Community Boards, one of the first community mediation programs in the country. For more than 10 years he was a mediator for the USDA Forest Service. He has also been a mediator for the Department of Fair Employment and Housing.

Currently Ken mediates cases for the U.S. Postal Service and for the Department of Interior. In each organization, he has maintained one of the highest successful conflict resolution rates of all mediators. Ken was the recipient of the Northern California Mediation Association's award for outstanding contributions in the field of mediation.

Ken has a graduate degree in Psychology/Organizational Development from Antioch University and an undergraduate degree from Howard University, with a major in Psychology and Music. In addition, he has received specialized training in the following: Theory of Conflict and Resolution (Raymond Schonholtz), Therapeutic Models for Training (Dr. Phillip B. Ziegler), Collaborative Problem Solving (Mike Doyle / David Strauss), Negotiation and Conflict Resolution (Bill Lincoln /Tom Colosi), Transformative Mediation (Michael Paige /Judy Saul), Advanced Transformative Mediation (Baruch Busch) and Managing Public Disputes (Susan Carpenter).

Ken was on the faculty of the Institute for Intercultural Communication in Forest Grove, Oregon and has been a guest lecturer at several educational institutions.