Emerging Leader: Tasheaya Warren Ellison

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Tasheaya Warren Ellison entered law school to become a white-collar criminal defense attorney. But then fate intervened. Ellison registered for a tax course solely to prepare for the Oregon State Bar. The next thing she knew, she was chasing after a degree in taxation. “I had an incredible tax professor who would tell us amazing stories about the tax planning she had done during her career. I was immediately hooked on the complexity of tax and the fact that it is ever-changing. I then became her research assistant and eventually went on to pursue an LL.M. in taxation,” Ellison explains. (Prior to getting her LL.M. in taxation, Ellison did in fact work for the county district attorney’s office in Portland, Oregon, where she was a criminal prosecuting attorney.)

Ellison, senior tax attorney, Treasury Tax Operations America at Shell Oil Company, has worked in a variety of substantive areas of tax, including international and domestic tax, partnerships, insurance, and SALT, but what she likes most is that tax has enabled her to be both a counselor and an advocate for the company. “On the counselor side, I enjoy interacting with the business leaders to arrive at a tax strategy which is supportive of the business strategy and contributes to the company’s bottom line. On the advocacy side, tax controversy allows me to advocate for the positions taken on the tax returns and to negotiate with tax authorities to resolve tax disputes,” she notes.

Challenging Tax Controversy

One of the more interesting and challenging tax matters Ellison has dealt with involved a state tax controversy where the state was citing federal tax statutes in support of its position to disallow certain deductions related to a cross-border transaction. “I was able to leverage my international tax experience to defend the return position taken and reach a favorable outcome for the company,” she says.

Ellison truly appreciates her tenure at Shell: “The most rewarding part of working for Shell is the ability to move to various roles within the company. While at Shell, I have had the opportunity to hold three diverse roles: senior tax attorney to Americas Trading, senior tax attorney–U.S. tax controversy and dispute resolution, and senior tax attorney to Americas Treasury Operations.”

Prior Work Experience

Before coming to Shell, Ellison worked for BP America, where she enjoyed providing tax planning advice and audit defense on complex global tax matters. Ellison enjoyed this role because it allowed her to leverage her U.S. international tax experience from the private sector and the government (Ellison was an attorney-advisor for the IRS Office of Associate Chief Counsel, International) and to provide tax advisory support to business operations outside the United States, including in Norway, Algeria, China, Indonesia, and Trinidad and Tobago. Ellison also was employed at Prudential Financial, where she worked on a variety of tax issues, including international and domestic tax, mergers and acquisitions, financial products, insurance, tax controversy, and tax policy matters. “My role at Prudential Financial was invaluable to me, because the tax department placed a strong emphasis on partnering with the business, understanding the business drivers, and delivering value to the company through tax, and those principles have continued to guide [me] through my career,” Ellison notes. In addition, she worked at PwC on several interesting tax planning projects (mergers and acquisitions, IPOs, and divestments) and gained experience in tax compliance and income tax accounting.

“On the advocacy side, tax controversy allows me to advocate for the positions taken on the tax returns and to negotiate with tax authorities to resolve tax disputes.”
— Tasheaya Warren Ellison

Her first tax role was at PwC after she completed the LL.M. program at Georgetown University Law Center. While at PwC she worked on a tax opinion for a complex cross-border transaction, and years later (after she had moved on from PwC), the partner from the practice group contacted her with the news that the transaction had survived audit with no adjustment, because of the work she had done on the tax opinion. “I considered this a great accomplishment because it reinforced to me the importance of both value creation (tax planning) and value protection (documenting defensible tax positions),” she explains.

Engaging Younger Tax Professionals

It’s important, she notes, for TEI to reach out to emerging tax professionals. TEI needs to find out their interests and invite them to become actively involved in committees, programs, and initiatives, she adds. “I became a member of TEI when I worked for Prudential Financial in New Jersey. The president of TEI’s New Jersey Chapter found out that I had taught a class for TEI’s Houston Chapter tax school; he asked me about my areas of interest and experience and invited me to become actively involved with the Chapter. I became the co-chair of membership and the international tax committee for TEI’s New Jersey Chapter and have continued to be an active member of TEI and have encouraged other tax professionals to join TEI.”

When not immersed in tax issues, Ellison spends time running, playing golf, studying languages (Chinese and Spanish) with her children, traveling, and cooking. “I am a pescatarian and enjoy cooking vegan dishes,” she notes.

Things to Know About … Tasheaya Warren Ellison

Title: Senior Tax Attorney–Treasury Tax Operations America
Organization: Shell Oil Company
TEI Chapter: Houston
Education: LL.M. in taxation, Georgetown University Law Center; J.D., University of Oregon School of Law; B.A. in marketing and management, University of Oregon, Robert D. Clark Honors College
Affiliations: TEI, International Fiscal Association, American Bar Association, and the National Bar Association
Birthplace: Portland, Oregon
Hobbies: Running, golf, and volunteer work (as a board member for the ovarian cancer foundation Judy’s Mission and for Arms Wide Adoption Services)

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