Top 10 Senate Staffers to Watch in 2025
Power dynamics are shifting in 2025, with new majorities, committee chairs, and leadership roles reshaping the landscape on the Hill. These changes are spotlighting staffers who aren’t just good at their jobs—they’re driving influence and playing pivotal roles in the 119th Congress.
These are the Top 10 Senate Staffers to Watch in 2025…
Allison Biasotti has been a loyal Schumer team member since 2016, starting as a staff assistant and now serving as his National Press Secretary for the past two years. As the Democratic Party searches for a clear leader in opposition to Trump’s presidency, she has a unique opportunity to shape Schumer’s messaging and solidify him as the voice of the Democratic Party.
Mark Isakowitz has been a fixture in Republican politics since the late 1980s. He’s spent the past few years in government affairs at Google and now he returns to Capitol Hill to take on a new challenge: advising the freshman Senator from Pennsylvania. Given his deep experience, all eyes will be on how he navigates this transition and what kind of impact he makes in shaping his boss’ early Senate career.
Jacques Petit is in a pivotal position with immigration at the forefront of the Republican agenda. As Communications Director for the newly elected Senator, he will play a critical role in crafting a clear Democratic stance on immigration, particularly for border-state Democrats like Senator Gallego. His ability to shape this conversation will be closely watched.
Trenton Armstrong has stepped into a major new role as Digital Director for the Senate Majority Leader, giving him the chance to shape the visual strategy for the majority party’s messaging. From video content to digital branding, he will play a crucial role in defining how Senate Republicans present their legislative and political priorities in the digital age.
Sarah Bittleman serves as Policy Director and Deputy Chief of Staff for the chairman of the Joint Committee on Taxation, putting her at the center of one of the biggest legislative battles of 2025: tax cuts. With a Trump White House and a Republican-led Congress prioritizing tax policy, Sarah will be instrumental in shaping the Democratic response to these proposals.
ICYMI: Top 10 House Staffers to Watch in 2025
Get to know the Staffers driving influence and playing pivotal roles on the House side in CNCT's Top Ten House Staffers to Watch in 2025.
Andrew King is a seasoned Digital Director and his skillset backs up the full meaning of the title. He’s spent time as a camera operator for the Olympics and worked as a Digital Director in state politics before making the jump to the Senate GOP. As Barrasso steps into his new role as Senate Republican Whip, Andrew is the “master” behind his social media presence. His ability to craft a compelling and effective digital communications operation will be closely watched.
Madeleine Marr works in an office that has been drawing significant national attention, and she is well-positioned to leverage that momentum. Passionate about housing policy, she is looking to advance bipartisan solutions for affordable housing—a rare policy area where common ground might be found. If she succeeds, she could play a key role in making housing reform a Senate priority.
Tess Haller has her hands full these days. Her boss, Senator Susan Collins, has always been known for her independent streak, but recent media attention has only amplified her national profile. As Collins’ Scheduling Director, Tess is tasked with ensuring that every TV appearance, interview, and public engagement runs smoothly. With Collins in high demand, Tess’ ability to manage the chaos will be put to the test.
Tommy Walker, now entering his 16th year on Capitol Hill, is a key adviser to Senator Amy Klobuchar as she continues to rise in Democratic leadership. With Senate Democratic leadership aging, this moment presents an opportunity for Klobuchar to emerge as a fresh, dynamic voice in the party—and Tommy will be right there, helping chart her path forward.
Erich Hartman is set to be at the center of a hotly debated issue early in this Congress: budget reconciliation. As Budget Policy and Review Director, this is his Super Bowl. His expertise will be critical in navigating the complexities of the process, and many will be watching to see how he steers the conversation and policy.