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Evident Partiality | Vacating, Modifying, and Correcting Awards | Businessperson’s Federal Arbitration Act FAQ Guide | Part I

November 23rd, 2021 Arbitration Agreements, Arbitration and Mediation FAQs, Arbitration as a Matter of Consent, Arbitration Law, Arbitration Practice and Procedure, Arbitration Provider Rules, Businessperson's FAQ Guide to the Federal Arbitration Act, Challenging Arbitration Awards, Evident Partiality, FAA Chapter 1, Federal Arbitration Act Enforcement Litigation Procedure, Federal Arbitration Act Section 10, Grounds for Vacatur, Nuts & Bolts, Nuts & Bolts: Arbitration, Petition to Vacate Award, Post-Award Federal Arbitration Act Litigation, Practice and Procedure, Section 10, Vacate Award | 10(a)(2), Vacate Award | Evident Partiality, Vacatur Comments Off on Evident Partiality | Vacating, Modifying, and Correcting Awards | Businessperson’s Federal Arbitration Act FAQ Guide | Part I By Philip J. Loree Jr.


Evident Partiality Section 10(a)(2) of the Federal Arbitration Act authorizes courts to vacate awards “where there was evident partiality or corruption in the arbitrators, or either of them. . . .” 9 U.S.C. 10(a)(2). The next few instalments will focus on evident partiality, a later one on corruption.

What constitutes evident partiality and under what circumstances is a controversial and sometimes elusive topic. We’ve written about it extensively over the years, including hereherehere, and here, as well as in other publications. The author has briefed, argued, or both, a number of U.S. Courts of Appeals and federal district court cases on the subject over the years, including, among others, Certain Underwriting Members of Lloyds of London v. State of Florida, Dep’t of Fin. Serv., 892 F.3d 501 (2018); and Nationwide Mutual Ins. Co. v. Home Ins. Co., 429 F.3d 640 (2005).

Evident partiality has been the subject of numerous judicial decisions setting forth various standards and applying them to a wide range of fact patterns.  The decisions are not easy to reconcile (some may be irreconcilable) and the standards are often of limited utility. Matters are complicated by judicially created rules concerning disclosure of potential conflicts of interest and the consequences that may or may not flow from those rules.

But “evident partiality” may be easier to grasp if we focus not on abstract standards or ethical constructs, but on the parties’ reasonable expectations of neutrality. Surprisingly, many courts address the subject of “evident partiality” without expressly discussing this important consideration, even when it appears to have been a significant but unstated part of the decision-making calculus. Others have expressly used the parties’ agreement and attendant expectations of neutrality as a guidepost.

Understanding the parties’ reasonable expectations of partiality is only half the battle. One must also understand how those expectations are enforced through judicially created rules governing disclosure and waiver of conflicts of interest, and the relevance of those rules to a motion to vacate an award under Federal Arbitration Act Section 10(a)(2).

In this instalment our focus is on the parties’ reasonable expectations of arbitrator neutrality. Later instalments will address evident partiality standards and how they are supposed to enforce reasonable expectations of neutrality without undermining arbitral finality; differences between evident partiality standards and judicial impartiality standards; the differing expectations of arbitral neutrality that may attend tripartite arbitration; and how evident partiality standards may implement and enforce those differing expectations; arbitrator disclosure procedures and requirements, which are designed to implement and enforce evident partiality standards; and examples of what does and does not constitute evident partiality.


The principal purpose of the Federal Arbitration Act is to enforce arbitration agreements as written.  See, e.g., First Options of Chicago, Inc. v. Kaplan, 514 U.S. 938, 947 (1995).  Parties are largely free to structure their arbitration agreements as they see fit, and that freedom extends to selecting the decision makers, establishing their qualifications, and agreeing on how impartial they should be.  See National Football League Mgmt. Council v. National Football League Players Ass’n, 820 F.3d 527, 548 (2d Cir. 2016) (“[A]rbitration is a matter of contract, and consequently, the parties to an arbitration can ask for no more impartiality than inheres in the method they have chosen.”) (citing cases); Merit Ins. Co. v. Leatherby Ins. Co., 714 F.2d 673, 679 (7th Cir.), cert. denied, 464 U.S. 1009 (1983) (Posner, J.) (“parties … choose their method of dispute resolution, and can ask no more impartiality than inherent in the method they have chosen.”) (citation omitted).

Inherent in the arbitral bargain is decision making, or at least decision tie breaking, by a neutral decision maker. Single arbitrators are required under the Federal Arbitration Act to be neutral unless the parties otherwise agree. See, e.g., Morelite v. N.Y.C. Dist. Council Carpenters, 748 F.2d 79, 81-85 (2d Cir. 1984). In tripartite arbitration, one arbitrator (usually designated the umpire, chair, or third arbitrator) is ordinarily required to be neutral, while party-appointed arbitrators are presumed to be non-neutral, except to the extent otherwise required by the parties’ arbitration agreement. See Certain Underwriting Members, 892 F.3d at 510-11; Sphere Drake Ins. v. All American Life Ins., 307 F.3d 617, 622 (7th Cir. 2002); Trustmark Ins. Co. v. John Hancock Life Ins. Co. (U.S.A.), 631 F.3d 869, 872-74 (7th Cir. 2011).

Arbitration provider rules, which may govern arbitrator qualifications in appropriate cases, may provide different rules. For example, the JAMS and American Arbitration Association rules presume all arbitrators on a tripartite panel to be neutral, unless the parties agree otherwise. JAMS Comprehensive Arbitration Rules & Procedures R. 7 (July 1, 2014); see also American Arbitration Association Commercial Arbitration Rules R-18(a) & (b) (October 1, 2013).

Section 10(a)(2) of the Federal Arbitration Act—which authorizes federal district courts to vacate arbitration awards “where there was evident partiality…in the arbitrators…”—imposes in part and enforces these neutrality requirements. Section 10(a)(2) establishes that parties who agree to arbitrate can legitimately expect that neutral arbitrators will meet a certain minimal standard of arbitral impartiality, and that arbitrators not appointed as neutrals can, in appropriate circumstances, be held to a substantial, material breach of a stipulated arbitrator qualification requirement related-to, but not necessarily coextensive with, neutrality. See Certain Underwriting Members, 892 F.3d at 510-11; Sphere Drake, 307 F.3d at 622; Trustmark631 F.3d at 872-74.

Many consider the requirement that an arbitrator be “neutral” to include two main components: the arbitrator must be (a) impartial and (b) independent. They also consider the requirement of impartiality to include a requirement that the arbitrator be “disinterested.”

While a case can be made for considering disinterestedness to be a component of impartiality, analyzing the two as separate components of neutrality promotes clarity and a more precise understanding of what comprises arbitrator neutrality. That, in turn, makes it easier for us to spot the presence or absence of neutrality in each case.

Evident Partiality: Independence

An arbitrator is independent when he or she is not directly or indirectly subject to the control of a party, potential witnesses, or the other arbitrators, is not affiliated with a party, does not act directly or indirectly in the interest of a party, and is otherwise not subject to undue influence or outside pressure. See, generally, Trout v. Organización Mundial De Boxeo, Inc., 965 F.3d 71, 80-81 (1st Cir. 2020); Demarco v. City of New York, 08-CV-3055 (RRM) (LB), slip op. at 8-9 (E.D.N.Y. Mar. 23, 2011); American Arbitration Association, The Code of Ethics for Arbitrators in Commercial Disputes Canon 1B(2) (arbitrator should not accept appointment unless “fully satisfied. . . that he or she can serve independently from the parties, potential witnesses, and the other arbitrators. . . .”) (March 1, 2004).

For example, an arbitrator would not be independent were she an agent or employee of one of the parties.

Evident Partiality: Disinterestedness

“Disinterested” means “lacking a financial or other personal stake in the outcome.” Trustmark,  631 F.3d at 872-73 (citing Caperton v. A.T. Massey Coal Co., 556 U.S. 868 (2009)); Certain Underwriting Members, 892 F.3d at 510; see Caperton, 556 U.S. at 876-81 (discussing cases). The requirement of “disinterest” was reflected in James Madison’s famous observation that “[n]o man is allowed to be a judge in his own cause; because his interest would certainly bias his judgment, and, not improbably, corrupt his integrity.” The Federalist No. 10, p. 59 (J. Cooke ed. 1961) (J. Madison)); see Caperton, 556 U.S. at 876.

The rule that financial or personal interest spoils neutrality does not require proof that the decision-maker would be or was actually biased against or partial to one party or the other. It does not address whether the arbitrator actually has predispositions concerning any of the parties, witnesses, or issues.

It is prophylactic rule, based on human nature, that a person having a financial or personal interest in the outcome of a dispute cannot be considered neutral, even if the decision maker honestly believes that his or her interest in the dispute would or did affect his or her judgment, and even if it could be shown objectively that the decision maker could or did judge the dispute impartially and independently.

The rule serves two functions. First, all else equal, by disqualifying interested decision makers, it eliminates the risk that personal or financial interest will affect decision-maker neutrality. Without the rule the difficulty of proving actual bias would mean that decisions made by interested decision-makers could in many cases not be overturned because it would be difficult or impossible to prove that the interested decision maker was actually biased or partial.

Second, the rule helps encourage public confidence in decision-maker neutrality by disqualifying interested decision-makers.


To be neutral an arbitrator must not only be disinterested, but also impartial. See, e.g., Trustmark, 631 F.3d at 872-73; U.S.Care, Inc. v. Pioneer Life Ins. Co. of Ill., 244 F.Supp.2d 1057, 1062 (C.D. Cal., 2002). To be “impartial” means to be free from “bias or prejudice” in favor of one of the parties. See Liteky v. United States, 510 U.S. 540, 550, 552 (1994).

In Liteky the U.S. Supreme Court explained, in a case concerning judicial partiality standards, that the terms “bias,” “prejudice” and “partiality” all connote a favorable or unfavorable disposition or opinion that is somehow wrongful or inappropriate, either because it is undeserved, or because it rests upon knowledge that the subject ought not to possess…or because it is excessive in degree….” 510 U.S. at 550, 552.

Arbitral or judicial predispositions may be formed as a result of any number things, and can be appropriate or inappropriate, reasonable or unreasonable. But such predispositions do not constitute “partiality,” bias or prejudice unless they are wrongful or inappropriate.

The Supreme Court’s interpretation of what “bias,” “prejudice” and “partiality” mean in the judicial context in Liteky is right in line with Section 10(a)(2) itself, which authorizes vacatur where the arbitrator is “guilty” of “evident partiality.” 9 U.S.C. § 10(a)(2) (emphasis added).

Neutral versus Impartial: Terminology Glitches

Unfortunately, the terminology used by Section 10(a)(2) (and by courts interpreting it) is not always consistent with that used by arbitration providers and other arbitration professionals.

Section 10(a)(2) refers only to “evident partiality,” not neutrality. Under the terminology commonly employed by arbitrator providers, “evident partiality” would not encompass an arbitrator’s lack of independence from a party.

But courts generally, and we think correctly, consider evident partiality to include an evident personal or financial interest in the outcome of the dispute, an evident inappropriate predisposition in favor of or against a party, or an evident lack of independence.

The next instalment will begin with a discussion of how evident partiality standards are designed to enforce party expectations of neutrality without undermining arbitral finality.

Contacting the Author

If you have any questions about arbitration, arbitration-law, arbitration-related litigation, or this article, or if you wish to discuss whether the Loree Law Firm might be able to provide assistance with or representation in a particular legal matter, please contact the author, Philip Loree Jr., at (516) 941-6094 or at

Philip J. Loree Jr. has more than 30 years of experience handling matters arising under the Federal Arbitration Act and in representing a wide variety of clients in arbitration, litigation, and arbitration-related litigation. He is licensed to practice law in New York and before certain federal district and federal appellate courts.  

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