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Tandem is a full-service sports and entertainment agency with expertise in athlete management, talent representation, marketing, communications and publicity services. Collectively, our employees have over 100 years of experience in the sports and entertainment industry and we represent some of the biggest stars in professional sports and broadcasting, including elite NBA and WNBA athletes, broadcasters, coaches, industry executives and sports organizations.




The extra mile. It's hard to define. But you know it when you see it. It's about effort and commitment. About never settling for less than the very best we have to offer. That's the + in Tandem. It's treating every client like one in a million, not one of a million. It's the promise that we will go above and beyond, every day.




Tandem clients are consistently recognized for both their talent and their character. We are proud to be the ones working behind the scenes to help them achieve this extraordinary success.

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For the past 18 years, Jim has represented professional athletes in a range of matters—from player contract negotiations to advertising and marketing contracts. He is certified as an agent by both the National Basketball Players Association and the Women's National Basketball Players Association. Recognized several times in Washingtonian's list of "Top Lawyers" for media and sports law, Jim has also been selected twice by Sports Illustrated as one of the "101 Most Influential Minorities in Sports."

In addition to professional athletes, Jim also represents a number of broadcasters and professional and college coaches in employment contract negotiations. He was a Morehead-Cain Scholar at the University of North Carolina at Chapel Hill and received his BA in 1990, going on to earn his JD from the University of Chicago. Before founding Tandem, Jim worked as an attorney at Skadden, Arps, Slate, Meagher & Flom, before becoming a partner at Williams & Connolly LLP. Jim is admitted to the bars of Illinois and the District of Columbia.


Derrick Powell
Vice President, Athlete Representation

Derrick represents players in the National Basketball Association and internationally. He is certified as an agent by the National Basketball Players Association and has handled contract negotiations, marketing and other off-the-court matters for more than fourteen years.

Derrick began his career in 1999 as the President and Founder of the Sports Team LLC, where he represented Devin Brown of the San Antonio Spurs and Billy Thomas of the New Jersey Nets and Washington Wizards. Before joining Tandem, Derrick worked for The Higgins Group and Excel Sports Management. He is a graduate and four-year letterman in basketball at Hampton University where he majored in Mass Communications.


Meredith Geisler
Senior Vice President, Communications

Meredith coordinates the extensive public relations efforts for each of our sports clients. She has over twenty-five years of experience in sports public relations, having previously worked as a Director of Media Relations at Advantage International and at Fila USA. Meredith graduated from Washington University in St. Louis and received her Master’s Degree in Sports Management from the University of Massachusetts. Meredith is also an adjunct professor in Sports Media & Communications at American University, Georgetown University and George Washington University.


Helen Dooley
Senior Vice President, Talent Representation/General Counsel

Helen drafts and negotiates the off-the-court agreements for Tandem's clients, including appearances, licensing, and endorsement deals. She also assists athletes with non-sports business deals and negotiates publishing and broadcasting contracts. Helen received both her undergraduate (magna cum laude, Phi Beta Kappa) and law degrees from Duke University. Helen is admitted to the bars of the District of Columbia and North Carolina.


Shana Martin
Senior Vice President, Client and Business Operations

Shana serves as a resource for our clients, monitoring professional and personal obligations, tracking payment obligations of companies endorsed by our clients, and overseeing other client obligations. She oversees all administrative matters for our clients as well as our practice, and is also certified as an agent by the Women's National Basketball Association. She graduated from the University of Pennsylvania with a degree in Political Science.


Matt Laczkowski
Director, Athlete + Talent Representation

Matt assists with the on- and off-court representation of Tandem's basketball clients. He analyzes NBA team rosters and salary cap situations, and applies Collective Bargaining Agreement rules to player salaries, free agency, trades and other contract provisions. Additionally, Matt helps to align clients with like-minded companies and pursues opportunities to strengthen client brands, business, and philanthropic endeavors. Matt also assists with negotiating and drafting off-the-court agreements.

Matt received his BA in Sports Marketing from the University of North Carolina at Chapel Hill, where he was a walk-on member of the basketball team. He earned his JD from the University of Maryland, where he served as the President of the Arts, Entertainment and Sports Law Society. Matt is admitted to the bars of Maryland and the District of Columbia.


Leslie Groves
Vice President, Marketing + Brand Development

A sports industry veteran, Leslie procures marketing and endorsement opportunities for Tandem clients. She works to generate revenue and develop and implement fully-integrated action plans and programs. Prior to joining Tandem, Leslie’s experience included the USTA/Mid-Atlantic Section, Score Results Marketing and Communications, Nordstrom, Greenberg Quinlan Rosner Research, Snowsports Industries America, Women’s Sports Foundation, Galyans Sports & Outdoor, Boys & Girls Club of America, and Nike, Inc. Leslie earned a Bachelor of Science in Business at Oregon State University.


Alison Tanner
Vice President, Operations

Alison oversees company operations and procedures such as payroll, benefits, supply acquisition and assigning and monitoring clerical functions. She also plans and implements office systems, layouts and equipment procurement. Alison graduated from the University of Illinois at Urbana-Champaign with an undergraduate degree in Electrical Engineering. She received her MBA and JD from the University of Chicago and previously worked in corporate finance at Friedman Billings Ramsey and Capital One. Alison is admitted to the bars of Illinois and the District of Columbia.


Washington Business Journal
Best Places To Work 2015

Tandem Sports + Entertainment is proud to be honored as a 2015 Washington Business Journal Best Places to Work winner. Tandem’s collaborative and team first atmosphere make it an inviting, successful and family-oriented workplace. Read more about the honor here.

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Katherine O'Toole
Manager, Public Relations

Katherine provides public relations, social media and general communications support for Tandem and Tandem’s clients. Prior to joining Tandem, Katherine spent two seasons working for the Washington Wizards communications department as a PR intern (2012-13) and public relations game night assistant (2013-14). Katherine received her BA in Communication with a focus in Public Relations from the University of Maryland, where she assisted the Media Relations Department with all sports and served as the school’s Sports Information Director for the women’s gymnastics team.


Erika Loomer
Coordinator, Marketing + Brand Development

Erika delivers client relations, business development, and marketing and branding support for Tandem and Tandem’s clients. Prior to Tandem, Erika served as the marketing and communications coordinator at the non-profit, Team IMPACT. She also has experience from internships, including with the Indianapolis Indians, University of Central Florida Athletic Department, and the New York Knicks. Erika earned her BS in Sports Management from Adelphi University. She continued her studies at the University of Central Florida where she earned both a Master of Sports Business Management and a Master of Business Administration as a part of the DeVos Sports Business Management Graduate Program.


Graham Boone
Director, Basketball Operations

Graham is certified as an agent by the National Basketball Players Association. Graham understands how teams value statistical performance as well as game performance, and uses that knowledge to analyze NBA team rosters and salary cap situations. He also conducts market research and statistical analysis for contract negotiations, and works on NBA Draft matters and free agent contract negotiations. Graham was a Morehead-Cain Scholar at the University of North Carolina at Chapel Hill, where he earned his BA in Sports Administration.


Vickie Lee
Receptionist + Administrative Assistant

Vickie is a highly-trained executive assistant with more than sixteen years of experience in customer support and administrative management. In addition to her hospitality receiving guests at Tandem offices, Vickie works closely with all other staff to ensure that Tandem’s client service is second-to-none. Vickie’s professional education includes extensive certification in records and expense management systems.

Jim on big photo

Jim Tanner

Derrick on big photo

Derrick Powell

Meredith on big photo

Meredith Geisler

Helen on big photo

Helen Dooley

Shana on big photo

Shana Martin

Matt on big photo

Matt Laczkowski

Leslie on big photo

Leslie Groves

Alison on big photo

Alison Tanner

Katherine on big photo

Katherine O’Toole

Grahamb on big photo

Graham Boone

Grahamb on big photo

Erika Loomer

Vickie on big photo

Vickie Lee

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