About Our Firm

Bright, engaged, and committed to your success.

Meet our awesome team.


The Partners & Team

Join Our Team

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Submit your resume and tell us a little bit about yourself.


When we’re recognized as leaders in national and international publications, websites and news outlets, it’s because our clients are making it happen.

Life is a process of becoming, a combination of states we have to go through. Where people fail is that they wish to elect a state and remain in it. This is a kind of death.

On The Record

When a major publication quotes us for expertise, we like to add their name to a growing colorful list.

la times mg magazine cannabis business executive rolling stone marijuana venture associated press marijuana business daily press democrat cnn daily journal politico modesto bee la weekly entrepreneur magazine san francisco business journal san francisco chronicle wall street joural los angeles daily news new york times cannabis now washington post Double Blind Law 360 Vox Media

Podiums & Powerpoints

Come say hello next time you see us at one of these events where we happily speak to industry and investor audiences across the West Coast about timely and interesting topics.

Cannabis Cultivation Conference

BASF – Bar Association of San Francisco

Psychedelic Bar Association



California State Association of Counties

International Cannabis Business Association

National Cannabis Industry Association

California Cannabis Industry Association




Future Cannabis Project

Psychedelic Liberty Summit

CalNORML Legal Seminar

Microscopes & Machines

Los Angeles Cannabis Task Force Townhall

California Growers Association




“The Cannabis Connection” Santa Cruz Radio Show

“The Monday Ag Update” San Francisco Bay Area Radio Show


Green Trade Santa Cruz

Women Lawyers of Santa Cruz County

Emerald Exchange

Cannabis Business Times Conference

Cannabis In California Law Seminars

Humboldt County Growers Association

Asian Commercial Professionals Association

Santa Clara Bar Association

Appraisal Institute Convention

Meadow Licensing Workshop

Los Angeles County Bar Association

Nevada County Cannabis Alliance

Business of Marijuana

Environmental Law Conference

Students for Sensible Drug Policy (SSDP)



We Work Where You Work

We represent our clients in every corner, nook, cranny, and metropolis of the Golden State.

Our network of clients and experience working with local and state governments all over the State of California means we’ve got you covered.


1541 Ocean Avenue, Suite 200, Santa Monica, CA 90401

201 Spear Street, Ste 1100
San Francisco, CA 94105

Local, Remote

400 Mccloud Ave.

Mount Shasta, CA 96067

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Ariel Clark


Ariel Clark is a business and regulatory attorney advising clients in highly regulated and emerging ecosystems.

For over 15 years, Ariel has been in the trenches of drug policy reform, helping to enact ecosystem-defining regulations while being deeply committed to her clients — leading operators, entrepreneurs, innovators, investors, and healers. When the idea of a robust, diverse, and regulated cannabis supply chain was considered impossibly out-of-the-box, she committed her practice to be of service to the plants and communities she is in deep connection with — foresight that was recognized by Rolling Stone, which named her one of 18 “Women Shaping The Culture of Tomorrow.” Ariel’s hard work, intelligence, and tenacity have earned her a national reputation as one of the fiercest lawyers working on law reform related to drugs, plant medicine, and psychedelics. Ariel’s extensive legal and political expertise provide valuable counsel to other trailblazers building successful, impactful, and mindful organizations and offerings.

Ariel is a founding Board Member of the Psychedelic Bar Association (PBA), serves as the Board Steward of PBA’s Religious Use Committee, and participates in the Ethics Committee and Legislation and Regulation Committee (LARC). She co-founded and served on the Executive Committee of the Cannabis Law Section of the Los Angeles County Bar Association. She also co-founded the Cannaboss Womxn’s Circle, an active community of professionals collectively advancing feminine leadership in the cannabis ecosystem. Ariel’s other affiliations have included Chacruna Institute for Psychedelic Plant Medicines’ Council for the Protection of Sacred Plants, the International Cannabis Bar Association, California Native American Cannabis Association, California and National Cannabis Industry Associations, and California Growers Association.

Ariel has been involved in numerous policy-change organizations, one of which was the Los Angeles Cannabis Task Force, which Ariel founded and ran. The Task Force was instrumental in the passage of Measure M, which authorized the creation of a legal, regulated industry in LA. Over the last ten years, she has advised many other trade associations and drug policy reform organizations on regulatory and legal issues. Ariel regularly guest lectures at universities and law schools, including Columbia, Yale, and Harvard, and participates in community gatherings, conferences, and festivals.

Ariel’s nationally-recognized leadership is reflected in her inclusion in, among other accolades, Cannabis Business Executive’s “75 Most Important Women in Cannabis”; mg Magazine’s “30 Most Powerful Cannabis Lawyers”; Cannabis Law Report’s “Global Top 200 Cannabis Lawyers”; and Entrepreneur’s “Top 100 Cannabis Leaders.”

Prior to founding Clark Howell LLP (originally Clark Neubert LLP), Ariel captained her own firm, as well as worked with California Indian Legal Services (CILS) in CILS’s Oakland, Santa Rosa, and Eureka offices. While in law school, she participated with a group of other Native American law students in discussions at the United Nation for what became the UN Declaration on the Rights of Indigenous Peoples. Her holistic, forward-thinking, and thorough approach to law – coupled with deep policy expertise and progressive vision – is of enormous benefit to clients, colleagues, and fellow paradigm-shifters.

Featured Article

Nicole Howell


Nicole Howell is one of California’s most effective and respected cannabis business and regulatory attorneys.

Industry executives, private investors, and public companies turn to Nicole for her perspective and proven track record in advising the industry’s most successful operators through California’s challenging and dynamic market.

In serving as general counsel to the state’s movers and shakers, Nicole has guided her clients over the major (and novel) corporate and regulatory hurdles unique to a market in its first decade of existence. Her role as lead regulatory counsel in successfully closing one of 2019’s largest and highest profile Canadian public company acquisitions of a beloved California enterprise demonstrates her skill in navigating bet-the-deal matters of first impression. Her work in structuring the legal framework for the state’s most innovative and fastest growing delivery provider illustrates her dedication to rolling up her sleeves to craft creative legal solutions that fuel business growth. Bold businesses and brands rely on Nicole’s counsel to be rooted in a rich understanding of the nuances, rules, and relationships that go into winning a successful outcome.

Nicole works actively with local and state legislative and regulatory efforts, having served as a member of State Treasurer John Chiang’s Cannabis Banking Working Group, as Chief Policy Advisor to the California Growers Association, on the Board of California NORML, and currently is involved in other industry and business related organizations, including the National and California Cannabis Industry Associations, International Cannabis Bar Association, San Francisco Chamber of Commerce, and the Executive Committee of the Cannabis Section for the San Francisco Bar Association.

Nicole has been recognized as one of the top 75 “Most Important Women in Cannabis” by Cannabis Business Executive, of the “30 Most Powerful Cannabis Lawyers” by MG Magazine, annually ranked by Super Lawyers magazine since 2012, and recognized for several years running as an “Attorney to Watch” by Chambers and Partners USA. In 2018, the firm was recognized by Entrepreneur Magazine in the nation’s top five cannabis firms. Nicole regularly speaks, teaches, and writes on the topics of cannabis and hemp business and regulatory law, and the decriminalization of plant medicines and other emerging therapeutics.

Nicole is a Founding Board member of the Psychedelic Bar Association, an organization inviting lawyers to collaborate in making the practice of law in the psychedelic space truly soul-manifesting (that is, “psychedelic”).  She currently serves as Co-Interim Executive Director.

Prior to founding Clark Howell LLP (originally Clark Neubert LLP) Nicole practiced law at the San Francisco firms Clarence Dyer & Cohen LLP and Farella Braun + Martel LLP, where she earned a reputation as a tenacious, solution-oriented advocate in high stakes, parallel civil, criminal, and regulatory matters.

Heather Kirlin


Heather Kirlin brings to the firm over 15 years of experience representing companies in all stages of their life cycles, from formation to exit. She advises clients on a broad range of business transactions, including entity formation, mergers and acquisitions, debt and equity financings, redemptions and cross-purchases, joint ventures, executive employment agreements, and negotiating and drafting a wide range of commercial agreements.

Heather has particular expertise in the area of business acquisitions, having acted as lead M&A counsel representing both buyers and sellers in numerous stock purchase, asset purchase and merger transactions for clients in a variety of industries. Heather also has extensive experience in helping co-owners negotiate and define the terms of their internal business relationship in partnership agreements, operating agreements and shareholders’ agreements. At Clark Howell, Heather applies her years of experience as a corporate attorney to helping clients in the cannabis industry find practical solutions to complex matters.

Heather is a native of California, and grew up in Napa, where her family owned a vineyard and a winery. Heather also previously owned a business representing small, family-owned wineries in Sonoma in a collective tasting room. This background in the wine industry has instilled in Heather a deep appreciation of plants, nature and all things that grow, while also giving her a deep understanding of the unique challenges of operating a business in a highly regulated landscape. Applying her legal skills to the cannabis industry is a natural extension of this background, allowing Heather to draw on her experience to tailor pragmatic solutions to the legal issues cannabis businesses face.

Prior to joining the firm, Heather was a partner at the well-respected San Francisco firm Greene Radovsky Maloney Share & Hennigh LLP, where she specialized in business transactions for a diverse client base, including real estate companies, retail businesses, professional service providers, agribusinesses, and technology companies.

Nicole Laggner


Nicole Laggner is a highly effective and client focused attorney focusing her practice on supply chain transactions, regulatory compliance, corporate and intellectual property transactions, and local and state permitting and licensing matters. She successfully assists clients with business formation and transactional matters, including B2B contracts, equity and loan instruments, and intellectual property licensing agreements. In addition, Nicole appears before city councils, community forums, and other local regulatory bodies to advocate for the firm’s clients.

Nicole has extensive experience with all aspects of cannabis business formation and compliant operations, including license applications, zoning and land use issues, lobbying with local government, real estate and leasing matters, and corporate formation. Additionally, she has successfully settled license denials, breach of contract, and employment discrimination suits in the cannabis field. Nicole advises cannabis businesses on all aspects of regulatory compliance, including internal operations, packaging and labeling requirements, workplace protocols, and vendor contracts.

Before joining Clark Howell, Nicole practiced in the environmental and business litigation groups at international law firm Kilpatrick Townsend & Stockton where she handled complex business litigation, representing clients such as R.J. Reynolds Tobacco Co., Hanes Brands, Krispy Kreme Doughnut Corporation, and the class of plaintiff beneficiaries of Individual Indian Money trust accounts, known as Elouise Pepion Cobell, et al.

Nicole enjoys working with a diverse range of clients and values the strong relationships she builds with them. She has extensive experience advising and representing cannabis clients at every stage of their businesses. Nicole thrives on and excels at assisting clients achieve their goals and become leaders in this emerging industry.

Molly Ryan

Operations Manager

Molly is the captain of the helm for Clark Howell operations. With over a decade of experience as an executive level administrator, Molly expertly manages all integral administrative and operational matters for the firm while providing project and scheduling support to our attorney team.

Molly draws from her extensive work in educational giving foundations, her counseling experience and academic research, and her work with diverse adult student populations to cater to our clients. Molly is a passionate advocate for legal access to cannabis for medical and adult use.

Sherrie McCumber

Executive Administrator & Regulatory Analyst

Sherrie is an essential member of our team, multitasking her way through every day to keep the team and our client’s licensing matters running smoothly and efficiently as our Executive Administrator and Regulatory Analyst. She brings over 15 years of administrative and paralegal experience, working closely with attorneys and clients at all levels. Our attorneys lean on Sherrie for expert administrative support, scheduling, case management, and licensing, among many other critical tasks.

Sherrie has an extensive background with litigation and working in a variety of firms serving various industries. In addition to her paralegal skills, her knowledge, experiences, and passion for legal access to cannabis make her a valuable source of ideas and solutions to the everyday needs of the firm and our clients.