Carlyle served as chair of the Senate Environment, Energy & Technology Committee, as well as a member of the Ways & Means and Rules Committee. Carlyle was re-elected in 2018 for a four-year term with 89.3% of the vote against Libertarian Bryan Simonson.

Carlyle announced that he is not seeking re-election in 2022. The Seattle Times lauded Carlyle's public service.[1]

During Carlyle's years as committee chair, the Legislature has adopted among the most sweeping carbon legislation in the U.S. This includes: Climate Commitment Act (the second cap and invest carbon pricing legislation in anticipation of joining the Western Climate Initiative); Clean Fuel Standard; HEAL Act (environmental justice and equity), transportation package widely considered the greenest package in state history; commercial building standards; building efficiency standards, HFCs and more. Under the legislation, Washington is one of the few governments in the world with, in effect, binding and enforceable commitments to Paris Accord and the policy framework to achieve the reductions.

In 2019, Carlyle successfully prime sponsored comprehensive clean energy legislation, SB 5116, to require all electric utilities in Washington to transition to a 100-percent, carbon-neutral electricity supply by 2030 and to 100-percent carbon-free electricity by 2045. The bill was a cornerstone of Gov. Jay Inslee's climate agenda.

In 2018, he was one of only seven senators to vote against the Legislature's public records bill that was ultimately vetoed by Gov. Jay Inslee following a public outcry by the state's media and the public.^[4]

Carlyle's legislative priorities have been centered around budget policy and tax transparency, foster youth, higher education, energy and environmental priorities. In 2007, prior to his election, Carlyle authored the Passport to College Promise Program which was ultimately created by the Legislature.^[5]

Carlyle was first elected to the Washington House of Representatives in 2008,^[6] representing the 36th legislative district as a Democrat. He was appointed^[7] to the state Senate in 2016 to succeed veteran Sen. Jeanne Kohl-Welles who was elected in 2015 to the King County Council.

During Carlyle's seven years in the House he focused on a range of policy areas including budget, tax,^[8] higher education, transportation, health care, open data and election issues. He sponsored major legislation to reform higher education finance and improve the educational success of foster youth. Carlyle has been the prime sponsor of legislation^[9] in each year to abolish the death penalty^[10] and replace the policy with life in prison without the possibility of parole. Carlyle has been a critic^[11] of efforts to expand^[12] coal and oil trains and exports throughout the Pacific Northwest. He has been a vocal^[13] legal^[14] and political opponent^[15] of initiative promoter Tim Eyman's efforts to alter the state constitution to require a supermajority to raise taxes.

In 2013 Carlyle was appointed chair of the House Finance Committee^[16] and as a budget writer. During his three years as Finance chair, Carlyle sponsored legislation to provide transparency into Washington's tax structure.^[17] He also passed major legislation to reinstate Washington's estate tax^[18] as well reform the state's telecommunications taxation. In the Finance role, he was a prime sponsor^[19] and a supporter of the accountability^[20] and transparency provisions^[21][22] of the Boeing tax package,^[23] widely considered the largest state tax incentive package in U.S. history.^[24] Carlyle was publicly critical^[25] of the abbreviated process of the special session.

Carlyle was named in 2012 as "one of 12 legislators in the nation to watch" by Governing Magazine.^[26] He was named one of the most "tech savvy" legislators in the nation by GovTech.^[27] He was named by the progressive organization Fuse as a champion of tax reform.^[28] In 2016 he was awarded the Ballard/Thompson Award by the Washington State Coalition for Open Government,^[29] the state's premier organization for open government and public access to government information. In 2017, he received legislator of the year award from Washington Conservation Voters.^[30]

Carlyle announced he would not seek reelection on January 24, 2022.^[31]

Carlyle resides in Seattle with his wife Dr. Wendy Carlyle an anesthesiologist practicing at Swedish Medical Center in Ballard. They have four school-age children: Adi, Liat, Zev and Nava. Carlyle grew up in Bellingham, Washington and developed his interest in government while serving as a teenage page in Congress. He served as a page for two years in the U.S. Senate for Senators Warren Magnuson^[32] and Henry "Scoop" Jackson, and one year in the House of Representatives where he served briefly as personal page to Speaker Thomas P. "Tip" O'Neill, Jr. Carlyle's mother, Joan Hadiyah Carlyle,^[33] self-published her autobiography "A Torch in the Dark, one woman's journey."

Prior to his election, Carlyle was appointed by Governor Chris Gregoire in 2004 as a member of the Washington State Board for Community and Technical Colleges.^[34] He crafted legislation in 2007 as a citizen activist for foster youth, Passport to College Promise,^[35] a scholarship program. Carlyle was a citizen co-founder of the Seattle/King County Chapter of City Year, a national AmeriCorps program.

Carlyle received a bachelor's degree from the University of Massachusetts Amherst and a MPA from the John F. Kennedy School of Government at Harvard University.

• Washington State Legislature - Sen. Reuven Carlyle Official Washington State Senate site
• Official Reuven Carlyle Blog
• "Official Reuven Carlyle campaign website".