After law school, Gleason was alaw clerk for chief justiceEdmond W. Burke of theAlaska Supreme Court from 1983 to 1984. She was in private practice at the Alaska law firm Reese, Rice & Volland from 1984 to 1995,[4] and as a sole legal practitioner from 1995 to 2001.
On April 6, 2011, PresidentBarack Obama nominated Gleason to the United States District Court for the District of Alaska to a vacancy that had been created by JudgeJohn W. Sedwick, who assumedsenior status on March 13, 2011.[6][7] The nomination occurred on the recommendation ofSenatorMark Begich.[6] On September 8, 2011, theSenate Judiciary Committee reported her nomination to the Senate floor by avoice vote.[8] The United States Senate confirmed Gleason by an 87–8 vote on November 15, 2011.[9] She received her commission on January 4, 2012. She became chief judge on January 1, 2022.[5]
On July 31, 2015, Gleason ruled that environmental group Greenpeace USA would be fined $2,500 for each hour its activists block aShell Oil (A Dutch owned corporation) icebreaking ship from leavingPortland by dangling from theSt. Johns Bridge. The Shell icebreaker was part of a controversial move by Congress to allow a foreign-based corporation to drill in the Arctic. However by September 2015 Shell had abandoned their attempts to establish drilling operations in Alaska, citing dangerous conditions, high costs (over $7 billion spent), and little evidence of oil in the areas they had attempted to explore.[10]
On March 29, 2019, Gleason issued two additional rulings related to Alaskan environmental issues.[11] One ruling found that the administration ofDonald Trump unlawfully sought to open theChukchi Sea to offshore drilling activities. This area had previously been withdrawn from consideration whileBarack Obama was president. Gleason's finding hinged on the fact that theOuter Continental Shelf Lands Act of 1953 permits a President to withdraw certain areas from eligibility for offshore drilling, but only Congress can add such areas. A separate ruling blocked the Trump administration's attempts to use a land transfer to facilitate construction of a road through a federally-designated wetland in theIzembek National Wildlife Refuge. The road would have connected the towns ofKing Cove andCold Bay. A different land transfer plan had already been rejected in 2013 by the Department of the Interior. SecretarySally Jewell, in announcing the rejection, indicated that construction of the road would cause "irreversible damage not only to the Refuge itself, but to the wildlife that depend on it".[12]
On November 9, 2023, Gleason upheld the Biden administration's approval of the Willow project and rejected claims by anIñupiat group and environmentalists against it.[14]
Sharon L. Gleason is the granddaughter of Estonian politicianTimotheus Grünthal and Estonian feminist and lawyerVera Poska-Grünthal.[15] Estonian politician, lawyer and diplomatJaan Poska was her great grandfather.