Tyler Hassen

Executive, age 42

Exited govt: 11/XX/25 (self-reported)

As a Texas oil executive with myriad investments in the field, it’s clear why Tyler Hassen would want a senior role in the Department of the Interior even though his personal connection to Musk’s orbit is unknown. At DOI, Hassen has been promoted into increasingly senior roles and responsibilities while being shunted into positions that do not require Senate confirmation or for him to address his vast conflicts of interest.

Positions

Position	Notes
DOI	Sources Here’s what a Texas oil executive from DOGE is doing inside the Interior Department The Associated Press, 2025-05-27 FOIA response from DOI to the Nation Muckrock, 2025-04-15 Data Reveals Details About DOGE, Government Hiring in 2025 Bloomberg, 2026-01-09 DOGE official appointed head of policy at Interior E&E News, 2025-03-10 Controversial Interior Department Aide From DOGE to Leave Agency The New York Times, 2025-07-25 Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 2025-09-04 The Interior Department is taking steps to implement layoffs GovExec, 2025-09-24 LinkedIn profile for Tyler Hassen LinkedIn DOI 1/23/25-3/07/25 ($142,488) «FOIA response includes email to him on first day» DOI 3/07/25-4/XX/25 promoted to Acting Assistant Secretary of Policy, Management and Budget «ended with title change to Principal Deputy Assistant Secretary» DOI 4/XX/25-9/03/25 promoted to Principal Deputy Assistant Secretary «title change allows him to avoid Senate approval/ethics rules. He reported he was leaving the agency on 8/1, but was seemingly still in the role until 9/3» DOI 9/03/25-11/XX/25 unknown start type «Working on layoffs / consolidation; LinkedIn reports left in November»

Position

Notes

DOI

DOI 1/23/25-3/07/25 ($142,488) «FOIA response includes email to him on first day»

DOI 3/07/25-4/XX/25 promoted to Acting Assistant Secretary of Policy, Management and Budget «ended with title change to Principal Deputy Assistant Secretary»

DOI 4/XX/25-9/03/25 promoted to Principal Deputy Assistant Secretary «title change allows him to avoid Senate approval/ethics rules. He reported he was leaving the agency on 8/1, but was seemingly still in the role until 9/3»

DOI 9/03/25-11/XX/25 unknown start type «Working on layoffs / consolidation; LinkedIn reports left in November»

Systems

System	Notes
WRT DOI	Source The Interior Department is taking steps to implement layoffs GovExec, 2025-09-24 Workforce Reshaping Tool 8/XX/25 The AutoRIF software tool was adapted by DOGE engineer Riccardo Biasini into a web service to help automate the process of identifying staff to be laid off and conducting the operation. read-write access «Reported as using AutoRIF»

Events

Date	Event
1/28/25 DOI	Source Inside Trump and DOGE’s chaotic effort to release billions of gallons of California’s water CNN, 2025-03-07 Disruption Two DOGE staffers – Tyler Hassen and Bryton Shang – show up an Army Corp of Engineers dam in California and attempt to turn on water pumps to drain more wate one of California’s reservoirs to help fight fires in LA. This dam fed water to central California, far away from the LA wildfires the water was supposed to help.
2/16/25 DOI	Source December 2024 Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Official Tyler Hassen sets up the DOGE_DOI account on X.com
2/17/25 DOI	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Disruption Katrine Trampe and Tyler Hassen are invited to a series of meetings related to reviewing contracts at the Department of the Interior.
2/19/25 DOI, DOT, EOP	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Interagency A staffer at the EOP emails DOGE staff to take part in a webinar about the National Environmental Policy Act. Daniel Abrahamson, Katrine Trampe, Tyler Hassen
2/21/25 DOI, HHS	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Interagency Several DOGE staff at HHS and DOI are involved in a large meeting related to a contract with the Office of Refugee Resettlement (ORR) within HHS. Among other systems, this office maintains the Unaccompanied Children Portal, which was of interest to DOGE’s immigration focus. Katrine Trampe, Rachel Riley, Tyler Hassen
2/24/25 DOI	Source PEER Report Public Employees for Environmental Responsibility, 2025-04-15 Access Stephanie Holmes requests full admin access to the Federal Personnel Payroll System (FPPS) system to process actions for herself as well as DOGE members Katrine Trampe and Tyler Hassen. This is a shared service provided by DOI which handles payroll for approximately half of the federal government.
2/25/25 DOI	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Action Citing concerns that there is fraud in the federal payroll, the DOGE team at the Department of the Interior meets with the Interior Business Center Team to discuss their request to receive a log audit of all employee names, positions and hire dates as well as total pay for each pay period.
2/27/25 DOI, GSA	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Interagency DOGE staffers at the Department of the Interior meet with Nicole Hollander from GSA about leases to be cancelled. Katrine Trampe, Nicole Hollander, Tyler Hassen
2/27/25 DOI, OPM	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Interagency DOGE staff at DOI invite several of their counterparts from OPM to a meeting to discuss DOI Tech Systems. (fuzz: A michealal@x.com is also invited. Is it meant to be Micaela Lopez Ballefin?) Greg Hogan, Katrine Trampe, Riccardo Biasini, Tyler Hassen
2/28/25 DOI	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Disruption Officials at the US Fish and Wildlife Service meet with Katrine Trampe and Tyler Hassen to show them their system for reviewing and processing contracts and to identify ways for both to start approving new contracts for the organization.
c.3/03/25 DOI, GSA, OPM	Source Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2026-02-27 Interagency DOE staff (mostly from DOGE) meet exclusively with DOGE staff from both OPM and GSA to discuss DOI’s data centers, cloud infrastructure and software licenses. Derek Geissler, Greg Hogan, Katrine Trampe, Riccardo Biasini, Tyler Hassen
3/28/25 DOI	Source 'Chaos and Confusion' at the Crown Jewel of American Science The New York Times, 2025-03-31 Disruption Tyler Hassen places the CIO and CISO at the Department of the Interior on admininstrative leave under investigation for raising alarm about DOGE’s access and delaying Stephanie Holmes from having admin access to the FPPS system.
4/17/25 DOI	Source Interior secretary gives DOGE aide sweeping powers to remake department The Washington Post, 2025-04-21 Disruption The Washington Posts reports that both Tyler Hassen and Matt Luby are scrutinizing all grants at the Department of the Interior. They also requested a list of all grants going to Maine, perhaps to punish the state for its governor’s defiance of Trump.
4/17/25 DOI	Source Interior secretary gives DOGE aide sweeping powers to remake department The Washington Post, 2025-04-21 Official The Secretary of the Interior formally designates that Tyler Hassen is in charge of implementing cuts to the agency and reorganizing its offices and areas of responsibility.
6/06/25 DOI	Source After His Trump Blowup, Musk May Be Out. But DOGE Is Just Getting Started. The New York Times, 2025-06-07 Directory An article in the New York Times reports that both Tyler Hassen and Stephanie Holmes are still active at the DOI. Stephanie Holmes, Tyler Hassen
7/09/25 DOI	Source Huffman, Trahan Demand Answers on DOGE’s Unchecked Access to Sensitive DOI Data Amid Growing Security Concerns Democrats on the House Committee for Natural Resources, 2025-07-09 Oversight Ranking Democrats on the House Natural Resources Committee send a letter expressing concern and urging the Secretary of the Department of the Interior to immediately revoke DOGE’s access to the FPPS system that handles payroll for large parts of the US government.
8/18/25 DOI	Source DOGE official is still at Interior after expected exit E&E News, 2025-08-18 Report Despite announcing that he would be leaving the agency on August 1st, Tyler Hassen is still reportedly working at the Department of the Interior. It is unclear what his title is and where his work is focused, but he is still there.
9/02/25 DOI	Source Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 2025-09-04 Oversight Democrats on the House Committe on Natural Resources send a letter to the Secretary of the Interior requesting information about the activities of Tyler Hassen at the agency including his financial disclosure forms, communications with the ethics office and daily calendar.
9/03/25 DOI	Source Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 2025-09-04 Offboard A day after receiving the letter from House Democrats, the Secretary of the Interior amends his prior order naming Tyler Hassen to the position of Principal Deputy Assistant Secretary to instead be filled by another person at the agency not affiliated with DOGE. It’s unclear if this means that Tyler Hassen is out of the agency or is just in a different role.
9/24/25 DOI	Source The Interior Department is taking steps to implement layoffs GovExec, 2025-09-24 Disruption The Department of Interior is reportedly planning another round of layoffs for mid-October. This follows the loss of 7500 employees (nearly 11% of its workforce) already. The agency is reported to be using the AutoRIF software developed at OPM to run the process, and it is being run by Stephanie Holmes and Tyler Hassen, who did not leave the agency in August as previously reported.