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“Marshall is always available and is someone that I trust 100%; he has my and the company's best interest at heart."

Client Feedback, Chambers USA, 2021


Marshall is a member of Husch Blackwell’s Cannabis team, where he serves as outside general counsel for clients that are active in or entering into the regulated cannabis market in Colorado and nationally.

He works closely with individual entrepreneurs and executives on matters of marijuana and industrial hemp regulatory compliance, corporate structuring, debt and equity financing, governance, securities compliance, and mergers and acquisitions. In general, his representation of these companies and investors has been focused on:

  • Negotiating the acquisition and sale of licensed marijuana businesses 
  • Developing corporate structures to comply with complex regulatory requirements
  • Protecting and commercializing intellectual property
  • Structuring financing and commercial contracts consistent with the regulatory scheme
  • Assisting clients with regulatory and policy matters

Prior to joining Husch Blackwell, Marshall served as general counsel for a prominent music streaming startup as it transitioned from an early to growth-stage company. He continues to represent a number of emerging technology companies. Marshall also regularly assists the firm’s middle and large market clients with mergers and acquisitions and commercial transactions.

“Marshall is always available and is someone that I trust 100%; he has my and the company's best interest at heart."

Client Feedback, Chambers USA, 2021




  • Best Lawyers: Ones to Watch, Corporate Law, 2021
  • Chambers USA, Cannabis Law, Nationwide, 2021
  • 5280 Magazine, Denver Top Lawyer, Marijuana Law, 2021


  • J.D., University of Colorado Law School
  • M.B.A., University of Colorado Leeds School of Business
  • B.S.E., Purdue University


  • California
  • Colorado

Professional Memberships and Certifications

  • American Bar Association
  • Colorado Bar Association
  • National Cannabis Industry Association, Legal & Banking Committee, Board Member

Cannabis Experience

  • Negotiates the successful purchase of numerous adult-use and medical marijuana licenses and their associated businesses.
  • Structures several technology and intellectual property holding companies in the cannabis industry that develop and license proprietary technology and trademarks.
  • Advises emerging growth cannabis technology and business solution companies in connection with corporate formation, seed and series A financing and commercial contracts.
  • Represented clients in development of commercial greenhouses used by cannabis tenants in Colorado and California.
  • Provides ongoing regulatory, employment, tax, corporate and securities legal advice to various adult-use, medical and industrial hemp cannabis clients.
  • Assists public company clients active in the cannabis space with securities compliance and corporate structuring to comply with local regulatory regimes.
  • Represented cannabis operators in Colorado in administrative show cause orders, negotiation of remediation plans and stipulated settlement agreements with state and local agencies.
  • Provide strategic guidance, in coordination of federal and local lobbying efforts, to help clients mitigate continuing changes to cannabis regulations.
  • Represented private cannabis companies in the reverse merger into a public shell listed on the Over-the-Counter Bulletin Board (OTCBB).

M&A and General Corporate Experience

  • Assisted Anheuser-Busch in craft brewer acquisitions.
  • Represented medical device manufacturer in its sale to a private equity fund.
  • Represented large agricultural chemical company in spin-off of proprietary technology subsidiary.
  • Prepared co-packing and other commercial contracts on behalf of intellectual property holding companies for nutraceutical and food and beverage manufacturing.
White Papers | 2019
Insurance Risk in Cannabis Operations: Theory versus Practice

Cannabis industry participants face heightened risks when purchasing and using insurance products.

Blog | November 19, 2018
Due Diligence in Cannabis Transactions
White Papers | November 15, 2018
Due Diligence in Cannabis Transactions

While the basic principles of due diligence still apply, vetting existing marijuana and hemp businesses presents some unique variables and risks.

Media Mentions | January 17, 2020
Ag Professional: Is Hemp the New Soybean?
News Releases | December 10, 2018
Husch Blackwell Elects 25 to Partnership
Media Mentions | October 25, 2018 Higher Law: A 'Green Wave' Legalization Blueprint (log-in required) mention's Marshall Custer's interview with Slate's "Working" podcast about his six years working in cannabis law.

Media Mentions | October 21, 2018
Slate: How Does a Marijuana Lawyer Do His Job? (AUDIO)

Meet Marshall Custer, who co-leads the cannabis law practice at Husch Blackwell (This 47:15 podcast is part of Slate's "Working" series).

Listen to the podcast.

Marshall enjoys woodworking, playing the drums, and of course, spending quality time with his family.

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