Photograph of Daniel Parrish


  • University of Minnesota, B.S. biomedical engineering and physiology (2008)
  • William Mitchell College of Law, J.D. (2014) cum laude


  • Illinois
  • U.S. Patent and Trademark Office (USPTO)

Professional Experience

  • OcuTherix, Inc.
    Engineering Consultant, 2014
  • ClarVista Medical Inc.
    Patent Agent, 2013–2014
  • Apnex Medical, Inc.
    Patent Agent, 2010–2013
    Biomedical Engineer, 2008–2013
  • 3M
    Technical Aide, 2007–2008

Daniel Parrish

Phone: +1 312.840.3279
455 N. Cityfront Plaza Drive
Suite 3600
Chicago, IL 60611

Daniel Parrish draws on his engineering background to serve clients in patent prosecution, opinion work, and all phases of trial and motion practice. He focuses on patent litigation in federal courts and inter partes review (IPR) proceedings before the Patent Trial and Appeal Board (PTAB). He works with global companies to protect innovations relating to medical devices, automotive and aerospace components, design patents, and computer software. Having spent six years as a biomedical engineer, Daniel understands the complexities and challenges of technology design and implementation, and how these can be leveraged in patent applications and adverse proceedings.

Daniel has been involved in bench trials and mock jury trials; arguing motions and discovery disputes before judges and court-appointed Special Masters; taking and defending depositions; drafting summary judgment and appellate briefs; drafting IPR and reexamination briefs; drafting pleadings on invalidity, noninfringement, and claim construction issues; and managing teams during all aspects of fact discovery. Daniel is also a contributor to the patent treatise, Robert L. Harmon et al., Patents and the Federal Circuit (Bloomberg BNA), and has held the position since 2014. In addition to IP, Daniel is committed to pro bono work. He focuses on issues related to fair housing and wrongful eviction, and has first-chaired multiple bench trials.

Before transitioning into law, Daniel worked at med-tech startups involving neuro-stimulation treatments for obstructive sleep apnea, and ophthalmology treatments for cataracts and glaucoma. He is an inventor on three issued patents (plus one pending patent application) and has authored multiple academic publications. He graduated with honors from the William Mitchell College of Law, holding an editor position in an IP law journal. Daniel holds a Bachelor of Science from the University of Minnesota, double majoring in Biomedical Engineering and Human Physiology.


  • The Best Lawyers: Ones to Watch–Commercial Litigation, 2021
  • CALI awards: Patent Litigation; Start-Up Business Enterprise.
  • 1st Place, Minnesota Intellectual Property Law Association (MIPLA) Cup Moot Court Competition
  • Regional Semi-finalist, Giles Rich Patent Moot Court Competition


  • American Intellectual Property Law Association (AIPLA)
  • American Academy of Sleep Medicine (AASM)
  • Federal Circuit Bar Association
  • Lawyers’ Committee for Better Housing, Chicago, Illinois
  • Public Interest Law Initiative (PILI) Fellowship, April–August 2014
  • Young Professionals Board member, 2015–present
  • Legal Prep Community Law Clinic, Volunteer, 2018–2019


Admitted to practice: Illinois, U.S. Patent and Trademark Office (USPTO)


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The Best Lawyers in America 2022 Recognizes 53 Crowell & Moring Attorneys, One Selected as Lawyer of the Year