Adam David "Atom" Willard (August 15, 1973) is an American drummer who has been a member of several notable musical acts.

In 2007 Willard departed from the Offspring to focus on his work with Angels & Airwaves, and in April 2009 he also joined Social Distortion, but left the following March.

In 2000 he filled in as a touring drummer for Alkaline Trio and appeared with them in the music video for the single "Private Eye".

Willard also filled in with Moth in 2002 for tours in support of their third album Provisions, Fiction and Gear[5] and appeared in their music video for "I See Sound".

[7] In 2003 Willard became an official member of the Offspring, replacing long-time drummer Ron Welty who had left the group earlier that year.

Professional drummer Josh Freese had recorded the drum tracks for the band's 2003 album Splinter after Welty left the group.

[9] Willard joined shortly before the album's release and appeared with them in the music video for the single "(Can't Get My) Head Around You".

The Offspring released a Greatest Hits compilation in 2005 including two new songs, "Can't Repeat" and a cover of The Police's "Next to You".

[10] Willard appeared with the band in the "Can't Repeat" music video and recorded the drum tracks for "Next to You".

[12][13] Offspring singer Dexter Holland later commented: The simple truth is that Atom had been working on a few of his own projects during our down time, including Angels & Airwaves but other things too.

[15] In an interview with Shave Magazine, he said that felt the collective experience of all the members of the band made joining very easy for him.

"[17] The band, which also included former Box Car Racer/Hazen Street guitarist David Kennedy and former Distillers bassist Ryan Sinn, released their debut album We Don't Need to Whisper in May 2006.

It peaked at #4 on the Billboard 200[18] and spawned several successful singles including "The Adventure", "It Hurts", "Do It for Me Now", and "The War", and Willard toured extensively with the group in support of the album.

In July 2007, during production of the band's second album I-Empire, Willard left the Offspring to focus on his work with Angels & Airwaves.

[19] Prior to his split with Angels & Airwaves, Willard had completed recording all drum tracks for the group's fourth studio album Love: Part Two released in November 2011.

[29] In early 2023, Willard reunited with Skiba to form a new band, Lektron, alongside AFI bassist Hunter Burgan, and SpiritWorld guitarist Randy Moore.

[30] In the coming weeks, he was also announced to be reuniting with Alkaline Trio, this time as their full-time drummer following the departure of Derek Grant.