Tyler Hassen
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
Appointed:
1/23/25-3/07/25 $142,488 «FOIA response includes email to him on first day»
Promotion:
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»
Promotion:
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»
:
9/03/25-11/XX/25 unknown start type «Working on layoffs / consolidation; LinkedIn reports left in November»
Offboarding:
Left govt 11/XX/25 (self-reported)
Appointed:
1/23/25-3/07/25 $142,488 «FOIA response includes email to him on first day»
Promotion:
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»
Promotion:
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»
:
9/03/25-11/XX/25 unknown start type «Working on layoffs / consolidation; LinkedIn reports left in November»
Offboarding:
Left govt 11/XX/25 (self-reported)
| Source: | Here’s what a Texas oil executive from DOGE is doing inside the Interior Department The Associated Press, 5/27/25 |
| Source: | FOIA response from DOI to the Nation Muckrock, 4/15/25 |
| Source: | Data Reveals Details About DOGE, Government Hiring in 2025 Bloomberg, 1/09/26 |
| Source: | DOGE official appointed head of policy at Interior E&E News, 3/10/25 |
| Source: | Here’s what a Texas oil executive from DOGE is doing inside the Interior Department The Associated Press, 5/27/25 |
| Source: | Controversial Interior Department Aide From DOGE to Leave Agency The New York Times, 7/25/25 |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Source: | The Interior Department is taking steps to implement layoffs GovExec, 9/24/25 |
| Source: | LinkedIn profile for Tyler Hassen LinkedIn, |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
Events
1/23/25
Appointed:
Tyler Hassen starts at DOI.
Appointed:
Tyler Hassen starts at DOI.
| Appointed: | Tyler Hassen 1/23/25-3/07/25 |
| Salary: | $142,488 |
| Source: | Here’s what a Texas oil executive from DOGE is doing inside the Interior Department The Associated Press, 5/27/25 |
| Source: | FOIA response from DOI to the Nation Muckrock, 4/15/25 |
| Source: | Data Reveals Details About DOGE, Government Hiring in 2025 Bloomberg, 1/09/26 |
| Note: | FOIA response includes email to him on first day |
1/28/25
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.
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.
| Person: | Bryton Shang, Tyler Hassen |
| Source: | Inside Trump and DOGE’s chaotic effort to release billions of gallons of California’s water CNN, 3/07/25 |
| Agency: | DOI |
2/16/25
Official Action:
Tyler Hassen sets up the DOGE_DOI account on X.com
Official Action:
Tyler Hassen sets up the DOGE_DOI account on X.com
| Person: | Tyler Hassen |
| Source: | December 2024 Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI |
2/17/25
Disruption:
Katrine Trampe and Tyler Hassen are invited to a series of meetings related to reviewing contracts at the Department of the Interior.
Disruption:
Katrine Trampe and Tyler Hassen are invited to a series of meetings related to reviewing contracts at the Department of the Interior.
| Person: | Katrine Trampe, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI |
| DOGE Project: | Spending |
2/19/25
Interagency Coordination:
A staffer at the EOP emails DOGE staff to take part in a webinar about the National Environmental Policy Act.
Interagency Coordination:
A staffer at the EOP emails DOGE staff to take part in a webinar about the National Environmental Policy Act.
| Person: | Daniel Abrahamson, Katrine Trampe, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI, DOT, EOP |
| DOGE Project: | Deregulation |
2/21/25
Interagency Coordination:
Interagency Coordination:
| Person: | Katrine Trampe, Rachel Riley, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI, HHS |
| DOGE Project: | Immigration |
2/24/25
System 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.
System 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.
| Person: | Katrine Trampe, Stephanie Holmes, Tyler Hassen |
| Source: | PEER Report Public Employees for Environmental Responsibility, 4/15/25 |
| Agency: | DOI |
| DOGE Project: | Anti-Personnel |
2/25/25
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.
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.
| Person: | Katrine Trampe, Stephanie Holmes, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI |
| DOGE Project: | Fraud, Anti-Personnel |
2/27/25
Interagency Coordination:
DOGE staffers at the Department of the Interior meet with Nicole Hollander from GSA about leases to be cancelled.
Interagency Coordination:
DOGE staffers at the Department of the Interior meet with Nicole Hollander from GSA about leases to be cancelled.
| Person: | Katrine Trampe, Nicole Hollander, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI, GSA |
| DOGE Project: | Spending |
| Question: | Fuzz: A michealal@x.com is also invited. Is it meant to be Micaela Lopez Ballefin? |
| Person: | Greg Hogan, Katrine Trampe, Riccardo Biasini, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI, OPM |
| DOGE Project: | Spending |
2/28/25
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.
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.
| Person: | Katrine Trampe, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI |
| DOGE Project: | Spending |
c.3/03/25
| Person: | Derek Geissler, Greg Hogan, Katrine Trampe, Riccardo Biasini, Tyler Hassen |
| Source: | Second Production of FOIA materials from DOI to Sierra Club The Sierra Club, 2/27/26 |
| Agency: | DOI, GSA, OPM |
| DOGE Project: | IT Modernization, Spending |
3/07/25
Promotion:
Tyler Hassen promoted to Acting Assistant Secretary of Policy, Management and Budget at DOI
Promotion:
Tyler Hassen promoted to Acting Assistant Secretary of Policy, Management and Budget at DOI
| Promotion: | Tyler Hassen 3/07/25-4/XX/25 |
| Position Title: | Acting Assistant Secretary of Policy, Management and Budget |
| Source: | DOGE official appointed head of policy at Interior E&E News, 3/10/25 |
| Note: | ended with title change to Principal Deputy Assistant Secretary |
3/28/25
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, which gives her visibility into payroll for half of the federal government.
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, which gives her visibility into payroll for half of the federal government.
| Person: | Tyler Hassen |
| Source: | 'Chaos and Confusion' at the Crown Jewel of American Science The New York Times, 3/31/25 |
| Agency: | DOI |
| DOGE Project: | Impunity, Anti-Personnel |
4/17/25
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.
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.
| Person: | Matt Luby, Tyler Hassen |
| Source: | Interior secretary gives DOGE aide sweeping powers to remake department The Washington Post, 4/21/25 |
| Agency: | DOI |
| DOGE Project: | Spending |
Official Action:
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.
Official Action:
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.
| Person: | Tyler Hassen |
| Source: | Interior secretary gives DOGE aide sweeping powers to remake department The Washington Post, 4/21/25 |
| Agency: | DOI |
| DOGE Project: | Elimination, Anti-Personnel |
4/XX/25
Promotion:
Tyler Hassen promoted to Principal Deputy Assistant Secretary at DOI
Promotion:
Tyler Hassen promoted to Principal Deputy Assistant Secretary at DOI
| Promotion: | Tyler Hassen 4/XX/25-9/03/25 |
| Position Title: | Principal Deputy Assistant Secretary |
| Source: | Here’s what a Texas oil executive from DOGE is doing inside the Interior Department The Associated Press, 5/27/25 |
| Source: | Controversial Interior Department Aide From DOGE to Leave Agency The New York Times, 7/25/25 |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Note: | 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 |
6/06/25
Identification:
An article in the New York Times reports that both Tyler Hassen and Stephanie Holmes are still active at the DOI.
Identification:
An article in the New York Times reports that both Tyler Hassen and Stephanie Holmes are still active at the DOI.
| Person: | Stephanie Holmes, Tyler Hassen |
| Source: | After His Trump Blowup, Musk May Be Out. But DOGE Is Just Getting Started. The New York Times, 6/07/25 |
| Agency: | DOI |
7/09/25
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.
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.
| Person: | Katrine Trampe, Stephanie Holmes, Tyler Hassen |
| 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, 7/09/25 |
| Agency: | DOI |
8/18/25
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.
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.
| Person: | Tyler Hassen |
| Source: | DOGE official is still at Interior after expected exit E&E News, 8/18/25 |
| Agency: | DOI |
8/XX/25
:
:
| System Access: | WRT: Workforce Reshaping Tool |
| : | read-write, 8/XX/25 Tyler Hassen |
| Note: | 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. |
| DOGE Project: | Anti-Personnel |
9/02/25
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.
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.
| Person: | Tyler Hassen |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Agency: | DOI |
9/03/25
Appointed:
Tyler Hassen starts at DOI.
Appointed:
Tyler Hassen starts at DOI.
| : | Tyler Hassen 9/03/25-11/XX/25 |
| Source: | The Interior Department is taking steps to implement layoffs GovExec, 9/24/25 |
| Source: | LinkedIn profile for Tyler Hassen LinkedIn, |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Note: | Working on layoffs / consolidation; LinkedIn reports left in November |
Offboarding:
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.
Offboarding:
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.
| Person: | Tyler Hassen |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Agency: | DOI |
9/24/25
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.
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.
| Person: | Riccardo Biasini, Stephanie Holmes, Tyler Hassen |
| Source: | The Interior Department is taking steps to implement layoffs GovExec, 9/24/25 |
| Agency: | DOI |
| DOGE Project: | Anti-Personnel |
11/XX/25
Offboarding:
Offboarding:
| : | Tyler Hassen 9/03/25-11/XX/25 |
| Source: | The Interior Department is taking steps to implement layoffs GovExec, 9/24/25 |
| Source: | LinkedIn profile for Tyler Hassen LinkedIn, |
| Source: | Democratic Lawmakers Demand Interior DOGE Leader’s Financial, Ethics Docs Public Domain, 9/04/25 |
| Note: | Working on layoffs / consolidation; LinkedIn reports left in November |