Today marks Opening Day for Major League Baseball’s 2017 season, one that begins a little more than four months after the league and its players signed a new collective bargaining agreement. The five-year deal, which guarantees play uninterrupted by labor strife, also generated a healthy amount of billings for outside law firms advising the Major League Baseball Players Association.

The New York-based labor union, one of the most powerful bodies in professional sports, had more than a dozen legal advisers on its payroll in 2016, according to the organization’s annual LM-2 filing with the U.S. Department of Labor on March 31. The document covers the period between Jan. 1, 2016 and Dec. 31, 2016. Sidley Austin and Francisco-based litigation shop Altshuler Berzon took the top two spots in the legal fee standings, billing $346,222 and $221,328, respectively, for their work on behalf of the MLBPA.

Sidley litigation partner Virginia Seitz in Washington, D.C., a former head of the U.S. Department of Justice’s Office of Legal Counsel who returned to the firm in late 2014, has been a longtime legal adviser to the union. The MLBPA’s LM-2 filing shows that Sidley had a key role representing the union on its labor negotiations with the league, receiving an assist from Altshuler Berzon, which also continued in its role handling litigation work for the union.

Other firms on the MLBPA payroll last year include: Bordentown, New Jersey-based Jeff Fannell & Associates ($219,514); McCarter & English ($140,232); Pittsburgh’s Farrell & Reisinger ($86,403); Detroit-based health insurance litigator Todd Weglarz ($56,250); Washington, D.C.’s Bredhoff & Kaiser ($50,048); Hackettstown, New Jersey-based Margolin & Neuner ($37,200); Boston’s Hemenway & Barnes ($35,013); Winston & Strawn ($22,221); Cooley ($13,922); White & Case ($13,876); and Winston-Salem, North Carolina-based Enns Archer ($7,329).

Fannell is a former in-house lawyer with the MLBPA who has also done some collective bargaining work for the union, while McCarter & English is representing the organization in a royalties and trademark dispute with mobile app developer OneUp Games LLC. Farrell & Reisinger, a litigation shop formed by Big Law refugees, frequently advises baseball players accused of taking banned performance-enhancing drugs, something that the MLBPA classifies as “special health” work.

McBee Strategic Consulting, a lobbying shop acquired by Wiley Rein in December 2014, was also paid $40,000 by the MLBPA. Wiley Rein rebranded the unit late last year as Signal Group, which is the name of a Washington, D.C.-based entity that received another $8,000 from the MLBPA in 2016, according to its LM-2 filing. Kroll Associates Inc., a corporate investigations and risk consulting firm, was paid $296,834 for its services to the union.

The MLBPA has been led since December 2013 by former player Anthony “Tony” Clark, who received $2.1 million in total compensation last year. Clark took over as executive director following the death of predecessor and Harvard Law School graduate Michael Weiner from brain cancer. Weiner previously served as the union’s general counsel under longtime leader and fellow lawyer Donald Fehr, who received $112,221 in pension benefits in 2016. (Fehr, who retired as head of the MLBPA in 2009, also got $6,340 in “prepaid baseball tickets,” according to the union’s annual report.)

Kevin McGuiness, a Washington, D.C.-based lawyer and lobbyist hired by the MLBPA in 2014 as COO, took home $702,262 in total compensation last year. David Prouty, promoted by the union in 2013 to serve as its general counsel, was paid $765,457 in his role as in-house legal chief. Other in-house lawyers on the union’s payroll include senior attorney adviser Richard “Rick” Shapiro ($768,915); senior labor counsel Ian Penny ($607,260); and assistant general counsel Robert Lenaghan ($518,886), Matthew Nussbaum ($402,029), Heather Chase ($311,635), Robert Guerra ($205,783) and Gregory Dreyfuss ($137,909). (Nussbaum, who played baseball at the University of Notre Dame, recently spoke with his alma mater about his job.)

The MLBPA, as it does each year, also disclosed the amounts it paid arbitrators designated under the union’s labor contract with the league to adjudicate disputes between teams and players. Baseball or pendulum arbitrations—the term of art for that unique form of dispute resolution—are proceedings that occur each offseason as certain eligible players seek increases in their annual compensation.

Fredric Horowitz, the longtime king of baseball’s arbitration landscape, retained that crown in 2016. The Santa Monica, California-based arbitrator earned $56,016 from the MLBPA, which splits with the league the fees it pays arbitrators. But Horowitz’s position as head of the arbitration crew will be up for grabs this year following the union’s November decision to terminate Horowitz as a result of a decision he made in a case involving Los Angeles Dodgers infielder Charlie Culberson.

Other arbitrators paid by the union in 2016 were Howard Jacobs ($11,250); Sylvia Skratek ($10,612); Steven Wolf ($10,485); Matthew Goldberg ($8,628); James Oldham ($8,432); Elizabeth Neumeier ($8,301); Daniel Brent ($7,442); Phillip Laporte ($7,230); Jeanne Wood ($7,035); Mark Burstein ($6,719); Mark Irvings ($5,979); Margaret Brogan ($5,917); Andrew Strongin ($5,331); and Gary Kendellen ($5,059). Lou Melendez, a former in-house lawyer and international operations executive at MLB who retired from the league in 2012, received $76,934 from the MLBPA last year for his services as an arbitration consultant to the union.

Xavier James Sr., a sports and entertainment lawyer in Irvington, New York, who serves as founder as founder and president of The James Group LLC, was also paid $29,152 by the union last year for consulting work. James has worked with many high-profile sports clients, including former MLB star Gary Sheffield, who with James’ help became a registered player agent in retirement.

The MLBPA’s first labor deal with the league was signed in 1968. Collective bargaining battles in subsequent years—including a nearly calamitous work stoppage that canceled the 1994 World Series—have loomed in the background of relations between players and owners ever since.

Robert Manfred Jr., a longtime labor lawyer to the league and former partner at Morgan, Lewis & Bockius, took over as MLB’s commissioner in early 2015. The league’s general counsel is former Proskauer Rose partner Daniel Halem. MLB gave up its nonprofit status in 2007.

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