Tonight's guests include:

Ladd Everitt, communications director for the Coalition to Stop Gun Violence

Gov. Lincoln Chafee, (I) Rhode Island

Kirk Bloodsworth, exonerated from Death Row by DNA 

Here's tonight's soundtrack!

And here's executive producer Bill Wolff with a look at tonight's show:

Tonight's guests include:

Michael Isikoff, NBC News national investigative correspondent, live from Boston

Philip Mudd, former deputy director of the FBI’s National Security Branch, currently a senior research fellow at the New American Foundation and author of “Takedown: Inside the Hunt for al-Qaeda”

Col. Lawrence Wilkerson, (ret.), former chief of staff to Secretary of State Colin Powell

Steve Kornacki, host of “Up” weekends on MSNBC and senior political writer for Salon 

Here's tonight's soundtrack!

And here's executive producer Bill Wolff with a look at tonight's show:

Tonight's guests include:

Carol Rosenberg, reporter for the Miami Herald, has covered Guantanamo since 2002

Paul Rieckhoff, founder and executive director of Iraq and Afghanistan Veterans of America (IAVA) and Iraq war veteran

Happy birthday, Willie Nelson!

And here's executive producer Bill Wolff with a preview of what's to come:

Tonight's guests include:

Ezra Klein, Washington Post "Wonk Blog" columnist and MSNBC policy analyst

Gary Samore, former Coordinator for Weapons of Mass Destruction Counter Terrorism and Arms Control in the Obama administration, currently executive director for Harvard Kennedy School's Belfer Center for Science and International Affairs

Julie Burkhart of Trust Women Foundation, re-opening Dr. Tiller’s clinic in Wichita, KS

Tammi Kromenaker, director of Red River Women’s Clinic in North Dakota

Here's tonight's soundtrack. 

And here's executive producer Bill Wolff with a look at tonight's show:

Tonight's guests include:

Alice Hoagland, her son Mark Bingham was killed on United flight 93 on 9/11

Sen. Elizabeth Warren, (D) Massachusetts

Here's executive producer Bill Wolff with the most beautiful preview:

Tonight's guests include:

James Cavanaugh, former ATF special agent-in-charge

Therese Apel, reporter for the Jackson, Mississippi Clarion-Ledger

Mat Honan, senior writer for Wired magazine

Take a listen to tonight's soundtrack ...

while taking a look at tonight's video preview, featuring esteemed executive producer Bill Wolff:

Tonight's guests include:

Ali Soufan, former FBI special agent, proved the first link between the 9/11 attacks and al Qaeda, author of “The Black Banners: The Inside Story of 9/11 and the War Against al Qaeda”

Neal Katyal, former Acting Solicitor General of the United States, successfully argued the case of Hamdan v. Rumsfeld before the Supreme Court which challenged the policy of holding military trials at Guantanamo Bay

Here's tonight's soundtrack.

And here's senior producer Cory Gnazzo with a preview of tonight's show:

UPDATE: Apologies to everyone who's been trying to figure out where that jazz music was coming from on their computer. It turns out the embed code for the live stream for this event includes auto-play, so we were getting the pre-show on hold music.

You can watch the event live through this link.

Rachel is moderating a panel discussion at the Tyler Prize for Environmental Achievement 40th anniversary, from 11:15am until 1:00pm EST today. You can watch the discussion live here.

Also, feel free to submit your own questions to the panel via Twitter, using the hashtag: #Tyler 40

Rachel's book tour for the paperback release of Drift: The Unmooring of American Military Power is winding down - but it isn't over 'til it's over! You can still score tickets to one more event this weekend, if you plan to be in the NYC area. 

This Saturday, April 20, the Iraq and Afghanistan Veterans of America (IAVA) and Rachel will host a discussion + book signing event at Columbia University.  The event will feature a conversation between Rachel and Paul Rieckhoff, founder and executive director of the IAVA (and friend of TRMS), in addition to a book signing for all attendees. Doors open at 4pm EST. 

Details and sign-up information can be found here. Tickets are a bit pricey, but the money goes toward the IAVA and all the great things they do for our veterans. 

You can purchase your paperback copy of Drift here:

This year marks the 40th anniversary of the Tyler Prize for Environmental Achievement, which honors its laureates for their work in environmental science, energy and environmental health.

Tomorrow, Rachel will host a panel discussion between four leading environmental scientists, to discuss the variety of environmental concerns and achievements from the past 40 years, and what we face in the years to come. 

You can watch the live webcast of the discussion tomorrow from 11:15am until 1:00pm EST. The video feed should show up here closer to the start time.

Rachel will have some of her own questions for the panel, but she wants your help, too. If you have your own questions you want to add to the mix, tweet your questions before and during the discussion using the following hashtag: #Tyler40

The panel topic: "Environmental Change and Sustainable Well-Being: Environmental Trailblazers Examine Challenges and Opportunities." 

The panel features the following world-renowned scientists (including John Holdren, Assistant to the President for Science and Technology) and past Tyler laureates [after the jump]:

From the Tyler Prize folks:

Richard B. Alley, PhD - On the pace of climate change 

Evan Pugh Professor of Geosciences, Department of Geosciences, and Earth and Environmental Systems Institute, Pennsylvania State University; Host of PBS's EARTH: The Operators' Manual

John P. Holdren, PhD - On a clean energy future 
Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President's Council of Advisors on Science and Technology

Thomas E. Lovejoy, PhD - On sustaining biodiversity and ecosystems 
University Professor of Environmental Science and Policy at George Mason University; Biodiversity Chair at the Heinz Center for Science, Economics and the Environment

Mario J. Molina, PhD - On healthy air and urban populations 
Director of the Mario Molina Center for Energy and Environment; Professor of Chemistry and Biochemistry at the University of California, San Diego and the Center for Atmospheric Sciences at the Scripps Institution of Oceanography

Tonight's guests include:

Nicole Hockley, mother of Dylan Hockley, one of the victims of the Sandy Hook massacre

State Del. Charniele Herring, (D) Virginia, Virginia Democratic Party Chair and House Minority Whip

And here's bell-bottomed executive producer Bill Wolff with a preview of tonight's show:

Tonight's guests include:

Rev. Michael McBride of PICO National Network, holding a 24-hour long vigil at the National Mall in honor of gun violence victims

Dustin McDaniel, (D) Arkansas Attorney General

Here's executive producer Bill Wolff who is happy to preview tonight's show for you: