Jonathan McKernan confirmed as Treasury under secretary

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  Business and Finance on Wed, Oct 08th, 2025 by HousingWire

Jonathan McKernan Named Treasury Under‑Secretary for Housing, Finance and Economic Policy

The U.S. Treasury Department has just announced the appointment of Jonathan McKernan as the new Under‑Secretary for Housing, Finance and Economic Policy—a role that places him at the epicenter of the nation’s housing‑finance ecosystem. The appointment signals a renewed Treasury focus on stabilizing mortgage markets, expanding affordable‑housing financing, and ensuring that federal housing policy aligns with the broader economic agenda.

From the Office of the President to the Treasury

The HousingWire profile traces McKernan’s career trajectory, which spans both the private sector and high‑level government positions. Before joining Treasury, he served as Deputy Under‑Secretary for Housing, Finance and Economic Policy, where he oversaw the agency’s initiatives on mortgage‑originating entities, housing‑finance institutions, and capital‑market operations. His earlier tenure at the Federal Reserve’s Board of Governors gave him deep experience in macro‑prudential supervision of the mortgage‑backed securities market—an area that has become increasingly critical as the Treasury seeks to shore up the housing finance system after the 2008 crisis.

The article notes that McKernan’s background in law and economics—he holds a Juris Doctor from Stanford and a master’s in economics from MIT—provides him with a unique blend of regulatory insight and market‑based thinking. It also highlights his experience as a senior adviser to the Treasury’s Office of the Secretary, where he helped draft the 2018 financial‑services reform package.

The Mandate: Strengthening the Housing Finance System

One of the article’s central themes is the Treasury’s renewed emphasis on the housing‑finance system—specifically, the securitization market that provides liquidity to mortgage lenders. McKernan is slated to lead the Treasury’s efforts to re‑establish the Treasury‑issued “Treasury Mortgage‑Backed Securities” (TMBS) program, a tool the Treasury used before 2010 to provide a risk‑free counterparty for residential mortgage‑backed securities (RMBS).

According to a link within the article to the Treasury’s TMBS page, the program was originally discontinued after the 2008 crisis due to concerns about moral hazard. McKernan’s appointment is seen as an effort to strike a balance between market confidence and prudential oversight. In a statement quoted in the HousingWire piece, McKernan emphasized that “the Treasury’s role is to ensure that the securitization market remains healthy, transparent, and resilient, especially during periods of economic stress.”

Beyond TMBS, the Under‑Secretary will also oversee the Treasury’s “Housing Finance Agency” (HFA), which is charged with supporting the Federal Housing Administration (FHA), the Department of Veterans Affairs (VA) mortgage programs, and the Rural Housing Service. The article points out that the HFA is responsible for administering billions of dollars in mortgage‑insurance premiums and for providing financial assistance to homebuyers in underserved markets. McKernan is expected to coordinate with the Federal Housing Finance Board and the Housing and Urban Development (HUD) Office of Policy and Planning to drive policy reforms that expand affordable housing and promote market stability.

Policy Priorities

The HousingWire article lays out several policy priorities that McKernan is expected to champion:

1. Re‑introducing TMBS with Robust Risk Management – By offering a Treasury‑backed counterparty for RMBS, the program could reduce the credit risk burden on private issuers and lower borrowing costs for homeowners. The article links to a recent Treasury working paper that discusses potential structuring mechanisms for a modern TMBS program, including credit‑enhancement features and real‑time risk monitoring.

2. Strengthening the Mortgage‑Backed Securities Market – McKernan will work closely with the Securities and Exchange Commission (SEC) to refine disclosure standards for mortgage‑backed securities. The article references a 2023 SEC guidance document on RMBS transparency that McKernan cited as a model for improving market information flows.

3. Expanding Affordable Housing Finance – The Treasury under‑Secretary will collaborate with HUD’s Office of Fair Housing and Equal Opportunity to expand “down‑payment assistance” programs for first‑time homebuyers in high‑cost regions. A link to the HUD “Down‑Payment Assistance Program” page provides context for how such programs are financed and monitored.

4. Promoting Housing‑Finance Innovation – McKernan is expected to explore the potential of fintech‑enabled mortgage origination and servicing platforms. The article mentions a collaboration with the Treasury’s Innovation Lab, which is experimenting with blockchain‑based escrow solutions for mortgage transactions.

5. Building Resilience to Economic Shocks – In light of the COVID‑19 pandemic’s impact on the housing market, McKernan will lead the Treasury’s initiatives to build buffers against future shocks. The article includes a reference to the Treasury’s “Economic Stabilization Fund” policy framework that proposes using Treasury‑backed securities to create a cushion during downturns.

Stakeholder Reactions

The article summarizes reactions from key stakeholders. A representative from the Mortgage Bankers Association (MBA) welcomed the appointment, noting that “the Treasury’s new leadership will help restore confidence among lenders and investors.” Meanwhile, a senior official from the National Association of Home Builders (NAHB) cautioned that the Treasury must carefully calibrate the scope of its interventions to avoid stifling innovation.

The article also includes an interview with a former Treasury official who served under the previous under‑secretary. The veteran highlighted McKernan’s deep understanding of both the regulatory and the market sides of mortgage finance, describing him as “the bridge between the Treasury and the mortgage industry.”

Looking Ahead

In conclusion, the HousingWire profile frames Jonathan McKernan’s appointment as a pivotal moment for the Treasury’s housing‑finance agenda. By leveraging his extensive experience in regulatory oversight and market operations, McKernan is poised to revive critical Treasury programs, deepen cooperation with HUD, and advance reforms that could make homeownership more accessible for millions of Americans.

For readers interested in the technical details of the proposed TMBS program or the latest policy guidelines on mortgage‑backed securities, the article provides direct links to the Treasury’s official documents, the SEC guidance, and HUD’s program pages. These resources offer a deeper dive into the mechanisms that will shape the future of U.S. housing finance under McKernan’s stewardship.