Mark D. Spencer

Of Counsel

Bio Menu
  • Overview
  • Experience
  • Honors & Involvement
Bio overview

Mark Spencer is an experienced litigation attorney whose trial and appellate practice encompasses the areas of class action lawsuits, employee benefits litigation, insurance litigation, healthcare litigation, employment litigation and appellate law with a heavy emphasis on class action and ERISA litigation. Throughout his extensive career, he has handled more than 300 federal court cases and in excess of 60 federal appeals.

Much of Mark’s practice is devoted to regularly counseling and defending employers, insurers, administrators, fiduciaries, third-party administrators (TPAs), health maintenance organizations (HMOs), medical providers and benefits providers in a wide variety of disputes, including those involving administrative review proceedings, claims decisions, subrogation/reimbursement actions, alleged breaches of fiduciary responsibility, protected rights litigation, claims for prohibited transactions, alienation of benefits, plan service provider malpractice, reinsurance, and claims arising from reductions-in-force. In addition, he has defended clients in a number of class actions, including Employee Stock Ownership Plan (ESOP) actions, stock drop cases, and fiduciary stock litigation.

In an effort to help clients avoid future litigation, he works closely with the firm’s employee benefits attorneys, providing valuable advice regarding the design and implementation of employee benefits plans, and regularly counsels clients on ERISA and insurance compliance. He also drafts and reviews service contracts as part of his benefits counseling practice.

In addition to litigating cases involving employer-provided benefits, Mark represents insurance companies in traditional life, health, disability, property and casualty, and bad faith insurance litigation.

A portion of Mark’s practice is also devoted to appellate matters. Throughout his career, he has successfully represented clients before the U.S. Supreme Court and various federal and state appellate courts.

His achievements have earned him inclusion in The Best Lawyers in America (commercial litigation; employee benefits/ERISA law; ERISA litigation; insurance law) and Oklahoma Super Lawyers. He was selected by Best Lawyers as the “Oklahoma City Employee Benefits (ERISA) Lawyer of the Year” for 2015 and “Oklahoma City ERISA Litigation Lawyer of the Year” for 2016, honors only given to a single lawyer in each legal specialty in each community.

Mark is a frequent speaker on the specialty topics of ERISA and insurance litigation at the state and national levels. He has also been interviewed by the media for his analysis on U.S. Supreme Court decisions and has served as an expert witness in major litigation. He recently testified as an expert witness on behalf of a group of four insurance companies who were sued in California arising from a $215 million class action settlement in the Health Net/ Ingenix database litigation in New Jersey federal court.

Mark devotes a significant portion of his practice to pro bono representation. As part of his pro bono practice, Mark recently obtained a $300,000 federal jury verdict and a permanent injunction on behalf of a family against a man who had stalked and harassed them for 14 years. The case is believed to be the first time a federal court has permanently enjoined a behavioral stalker.

Mark advises clients on legislative and regulatory compliance issues and he is a member of the Federal Bar Association’s National Government Relations Committee.

Upon graduation from law school and before entering private practice, Mark served as a law clerk for the Honorable William J. Holloway, Jr., Chief Judge of the U.S. Court of Appeals for the Tenth Circuit.


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Experience, Honors, & Awards

Representative Experience

  • Rutledge v. Pharmaceutical Care Mgt. Ass’n, 141 S.Ct. 474 (2020). Counsel of record for J.B. Hunt Transport Services, Inc. as amicus curiae on the merits in support of the Respondent challenging Arkansas Act 900 regulating pharmacy benefits managers (PBMs) as pre-empted by ERISA. Brief commended to the Court by the former Solicitor General at oral argument.
  • The First Presbyterian Church USA v. Doe, 203 L.Ed.2d 131 (2018). Counsel of record for Oklahoma Wesleyan University as amicus curiae in support of a petition for a writ of certiorari challenging Oklahoma’s narrow interpretation of the religious autonomy doctrine.
  • Integris Health, Inc. v. Cates, 201 L.Ed.2d 1063 (2018). Counsel of record for the American Hospital Association, the Oklahoma Hospital Association, the Oklahoma Association of Health Plans, and The State Chamber of Oklahoma as amici curiae in support of a petition for a writ of certiorari in a class action involving ERISA preemption of state law claims by plan participants who have been billed at non-discounted rates by their medical providers.
  • Great-West Life & Annuity Ins. Co. v. Knudson, 534 U.S. 204 (2002). Counsel of record for the National Association of Subrogation Professionals, Inc. as amicus curiae on the merits in an ERISA subrogation case regarding the scope of appropriate equitable relief under ERISA’s civil enforcement provisions.
  • Great-West Life & Annuity Ins. Co. v. Knudson, 534 U.S. 204 (2002). Counsel of record for the Self-Insurance Institute of America, Inc. as amicus curiae in support of a petition for a writ of certiorari. Writ granted.
  • Bannister v. State Farm Mut. Auto. Ins. Co., 692 F.3d 1117 (10th Cir. 2012). Obtained a favorable judgment as a matter of law in federal district court overturning an adverse jury verdict, and an affirmance on appeal, in a phantom vehicle case.
  • Brown v. J.B. Hunt Transp. Servs, Inc., 586 F.3d 1079 (8th Cir. 2009). Obtained favorable reconsideration in the Eastern District of Arkansas, and a subsequent affirmance on appeal, holding that an employer did not violate ERISA by purportedly failing to furnish certain information and materials to a plan participant.
  • Gaither v. Aetna Life Ins. Co., 394 F.3d 792 (10th Cir. 2004). Represented an insurer in ERISA benefits denial action.
  • Conover v. Aetna US Healthcare, Inc., 320 F.3d 1076 (10th Cir. 2003), cert. denied, 542 U.S. 936 (2004). Obtained a favorable ruling that ERISA pre-empted Oklahoma bad faith law. Assisted in arguing Aetna’s position that certiorari should be denied in this case and instead granted in Aetna Health Inc. v. Davila, 542 U.S. 200 (2004).
  • Beaird v. Seagate Tech., Inc., 145 F.3d 1159 (10th Cir.), cert. denied, 525 U.S. 1054 (1998). Represented an employer in employment discrimination action involving a reduction in force at a plant.
  • Gaylor v. John Hancock Mut. Life Ins. Co., 112 F.3d 460 (10th Cir. 1997). Obtained a favorable ruling that the benefit plan in question was not exempt from ERISA under its safe harbor regulation, and that ERISA pre-empts Oklahoma bad faith and statutory claims handling law.
  • Shamrock Drilling Fluids, Inc. v. Miller, 32 F.3d 455 (10th Cir. 1994). Represented a national bank in obtaining an affirmance of a jury verdict, and post-appeal withdrawal of plaintiff’s aiding and abetting claim under §10(b) of the Securities Exchange Act of 1934 based on Cent. Bank v. First Interstate Bank, 511 U.S. 164 (1994).
  • In Re: Blue Cross Blue Shield Antitrust Litig., (MDL No. 2406) Master File No. 2:13-CV-20000-RDP (N.D. Ala.).  Represented a group of employers with self-funded health plans in objecting to the $2.6 billion antitrust settlement which allocated 93.5% to the fully-insured sub-class and 6.5% to the self-funded sub-class.
  • In re Nat’l Prescription Opiate Litig., Case No. 1-17-MD-2804 (N.D. Ohio); Pioneer Tel. Coop., Inc. Employee Benefits Plan v. Purdue Pharma, L.P., Case No. CIV-18-994-G. (W.D. Okla., filed Oct. 9, 2018). Counsel for plan fiduciaries acting as putative class representatives for ERISA benefit plans seeking to recover from opioid manufacturers and distributors in a multidistrict litigation case.
  • SWCC, LLC v. Allied Nat’l, Inc., 320 F.Supp.3d 1249 (D. Kan. 2018). Represented a third-party administrator who had been sued by an employer in an effort to coerce the payment of benefits to the owner-beneficiaries. The court held that removal was proper under 29 U.S.C. §1132(a)(3), rather than §1132(a)(1)(B), even though the employer, rather than the beneficiaries, was suing and even though the employer was claiming a breach of the third-party administration contract rather than a breach of the plan document itself.
  • Lavielle v. Acosta, 281 F. Supp. 3d 1133 (W.D. Okla. 2017). Obtained, pro bono, a $300,000 federal jury verdict and permanent injunction on behalf of two parents and their three minor children who had been stalked and harassed by the defendant for several years.
  • Sparks v. John M. Campbell & Co., Case No. CIV-15-469-W (W.D. Okla. Apr. 26, 2016). Obtained a dismissal of claims in a multimillion-dollar ERISA class action brought in federal court by employees of an ESOP-owned oilfield consulting business regarding claims around fiduciary duty and valuation.
  • Okla. Procure Mgt. LLC v. Sebelius, Case No. 5:2012cv00680 (W.D. Okla. Apr. 4, 2013). Obtained a favorable ruling reversing the Medicare Appeals Council’s decision and remanding the matter to the Secretary of Health and Human Services to compute the reimbursement amounts owed to a medical provider for administering proton therapy to patients.
  • Kelly v. OSMA Health & Welfare Benefit Corp., Case No. 4:06-cv-00161-JHP-FHM (N.D. Okla., May 31, 2006). Obtained a ruling that a lawsuit by a participant in the Oklahoma State Medical Association’s benefit plan was not exempt from ERISA under the safe harbor regulation even though the participant’s employer had no non-owner employees.
  • Warner v. Aetna Health Inc., 333 F.Supp. 2d 1149 (W.D. Okla. 2004). Obtained an affirmance of an ERISA insurer’s denial of benefits based on its determination that plaintiff could participate in a rehabilitation program and that he had refused to cooperate with efforts to initiate such a program.
  • Conover v. Aetna US Healthcare, Inc., 167 F. Supp. 2d 1317 (N.D. Okla. 2001). Persuaded a federal district court to reject the holding in Lewis v. Aetna U.S. Healthcare, Inc., 78 F.Supp.2d 1202 (N.D. Okla.1999), that ERISA pre-emption of state bad faith law had been overturned.
  • Great-West Life & Annuity Ins. Co. v. Clingenpeel, 996 F. Supp. 1348 & 1353 (W.D. Okla. 1998). Obtained a ruling rejecting federal common law “make whole” and “common fund” rules in an ERISA subrogation case.
  • Ward v. Reliance Std. Life Ins. Co., Case No. CIV- 96-00293-M (W.D. Okla. Dec. 5, 1997).  Obtained a judgment for the defendant following a federal trial in a benefits dispute arising from the Oklahoma City Murrah Building Bombing.
  • Melton v. White, 848 F.Supp. 1511 & 1513 (W.D. Okla. 1994). Obtained a permanent injunction and an award of attorney’s fees and costs to The Prudential Insurance Company of America in a dispute over Servicemen’s Group Life Insurance proceeds.
  • Metro. Life Ins. Co. v. Browning, 839 F.Supp. 1508 (W.D. Okla.1993). Represented an insurer in a lawsuit to determine the parties’ rights to the proceeds under the Federal Employees’ Group Life Insurance Act.
  • Ferguson v. The Prudential Ins. Co. of Am., 777 F.Supp. 15 (W.D. Okla. 1991). Obtained a favorable decision upholding the defendant insurer’s denial of benefits following a federal trial on the merits.
  • Health Net, Inc. v. RLI Ins. Co., 206 Cal. App. 4th 232, 141 Cal. Rptr. 3d 649 (2012). Testified as an expert witness on behalf of a consortium of liability insurance companies who were sued by Health Net, Inc. on the issue of Health Net’s exposure in various ERISA class action lawsuits in New Jersey that were settled for $215 million.
  • Prescott v. Okla. Capitol Preservation Comm’n., 2015 OK 54, 373 P.3d 1032. Co-counsel with the former Solicitor General in representing amicus curiae Prof. Mark DeForrest on whether Oklahoma’s Blaine Amendment prohibits passive displays on the state capitol grounds.
  • Cranfill v. Aetna Life Ins. Co., 2002 OK 26, 49 P.3d 703. Obtained summary judgment on bad faith claim, based on the existence of a legitimate dispute between the parties, by persuading the federal district court to certify the issue of whether decedent’s injury was intentionally self-inflicted to the Oklahoma Supreme Court.
  • Trice v. Burress, 2006 OK CIV APP 79, 137 P.3d 1253. Obtained a favorable ruling that church officials’ statements to parishioners about the reasons for plaintiff-employee’s termination were protected by the First Amendment.

Honors and Awards

  • Selected by peers for inclusion in The Best Lawyers in America (commercial litigation; employee benefits/ERISA law; ERISA litigation; insurance law)
  • Named “Oklahoma City Employee Benefits (ERISA) Lawyer of the Year” in 2015 and “Oklahoma City ERISA Litigation Lawyer of the Year” in 2016 by The Best Lawyers in America
  • Listed in Oklahoma Super Lawyers
  • Rated AV Preeminent by Martindale-Hubble Peer Review Ratings

Professional Organizations and Memberships

  • Oklahoma County Bar Association
  • Oklahoma Bar Association
  • Oklahoma Bar Foundation (Fellow)
  • American Bar Association
  • Federal Bar Association (Fellow; Former Member, Government Relations Committee )
  • Federal Bar Association, Oklahoma City Chapter (Past President, National Delegate, Board Member, and Pro Bono Chair)
  • Oklahoma Association of Defense Counsel
  • Ruth Bader Ginsburg American Inn of Court (Master Emeritus of the Bench)
  • Luther Bohanon American Inn of Court (Former Barrister)
  • National Association of Subrogation Professionals
  • SouthWest Benefits Association
  • Society for Human Resource Management
  • Christian Legal Society
  • The Federalist Society
  • Defense Research Institute

Civic Involvement and Leadership

  • Oklahoma Christian Counseling Center (Director)

ATPs display in this column

At The Podium

Increased Prescription Drug Costs: The Impact of PCMA v. Mulready

Oklahoma Bar Association Legal Lunch Box CLE
Online | July 13, 2022

Cybersecurity Guidance for Plan Sponsors: Administrative Practices

American Bar Association 2022 Mid-Year Tax Meeting
Online | February 3, 2022

Health Insurance Developments, including Employee Benefit Plans and Tribal Health Plans

Oklahoma Bar Association CLE
Oklahoma City, OK | October 18, 2019

The Money’s Gone. Now What? Possible Post-Montanile Remedies

American Conference Institute’s 14th National Forum on ERISA Litigation
Chicago, Illinois | March 1, 2017

Ethics: Ethical Considerations and Issues for the ERISA Practitioner, Including Conflicts of Interest

American Conference Institute’s 9th National Forum on ERISA litigation
Chicago, Illinois | April 14, 2015

Employee, Independent Contractor and Class Action Penalties under PPACA

SouthWest Benefits Association’s Annual Benefits Compliance Conference
Dallas, Texas | November 14, 2014

ERISA Fiduciary Litigation

American Conference Institute’s 7th National Forum on ERISA Litigation
Chicago, Illinois | April 29, 2014

Workers’ Compensation Law Update

2013 Winter Quarterly Training Conference of the Oklahoma Public Human Resources Association
Oklahoma City, Oklahoma | December 6, 2013

To ERISA or Not to ERISA

Oklahoma Injury Benefit Coalition Seminar — Oklahoma’s Changing Workers’ Compensation System: Don’t Be Left Behind
Oklahoma City, Oklahoma | November 5, 2013

Benefit Plans – Common Mistakes and Pitfalls

PartnerSource 2013 Employers' Conference
Dallas, Texas | October 17, 2013

The Oklahoma Employee Injury Benefit Act

EmployerLINC Seminar: Workers' Compensation Overhaul
Tulsa, Oklahoma | June 20, 2013

The Oklahoma Employee Injury Benefit Act

EmployerLINC Seminar: Workers' Compensation Overhaul
Oklahoma City, Oklahoma | June 19, 2013

Cigna v. Amara Revisited: The Ongoing Fallout From this Landmark Case and Its Progeny

American Conference Institute's 5th National Advanced Forum on Defending and Managing ERISA Litigation
New York, New York | January 22, 2013

409A Compliance and Correction: How to Adequately Administer Plans Given the Complexity of the Rules and Avoid Operational and Documentation Failures

American Conference Institute's National Advanced Compliance Forum on Minimizing Legal Risks in the Design, Implementation & Administration of Employee Benefits Plans
New York, New York | May 24, 2010 - May 25, 2010

Hidden Strategies to Health Plan Savings

Society of Human Resources Management Conference
Oklahoma City, Oklahoma | May 6, 2010

Service Provider Relationships: Defending and Managing Litigation that Arises Between Plans and Providers

American Conference Institute's Premier Forum on Defending and Managing ERISA Litigation
New York, New York | October 19, 2009 - October 20, 2009

Potential Legal Issues Facing a Health Board or Plan

Oklahoma State Medical Association’s OSMA Health Retreat
Tulsa, Oklahoma | February 20, 2009

Insurance/Benefit Law Update

Oklahoma Employment Law Association
Oklahoma City, Oklahoma | April 10, 2007

Insurance/Benefit Law Update

Oklahoma Corporation Commission
Oklahoma City, Oklahoma | November 16, 2006

Understanding Fiduciary, Criminal and Ethical Considerations in The ERISA Context

National Association of Subrogation Professionals’ 6th Annual Conference
Atlanta, Georgia | November 9, 2004
Attorney Articles

Industry Groups



  • Oklahoma, 1987
  • U.S. District Courts for the Western, Northern and Eastern Districts of Oklahoma
  • U.S. District Court for the Northern District of Texas
  • U.S. Courts of Appeals for the Fifth, Eighth, Ninth, Tenth and Eleventh Circuits
  • U.S. Tax Court
  • U.S. Court of Federal Claims
  • U.S. Supreme Court


  • J.D., with distinction, John Marshall Law School, 1987
    • Moot Court Executive Board; William Starr Insurance Law National Moot Court Competition, Hartford, CT (Third Place); Illinois State Bar Association Moot Court Competition, Springfield, IL (Second Place)
  • B.A., Tulane University, 1981