Louisa Holaday, MD, MHS
@louisaholaday.bsky.social
Primary care doc & health services researcher. I study how structural factors, neighborhood, & community influence health, including spillover effects of mass incarceration. Policy-oriented research. Trained by NYC. Now at Sinai; prior Yale, Monte, UMich
Reposted by Louisa Holaday, MD, MHS
People have studied this for decades, and the findings are pretty consistent: Immigration is unrelated or even negatively related to crime and cities w/lots of immigrants are likely safer than yours.
From Robert Sampson, The Great American City: Chicago and the Enduring Neighborhood Effect (2012).
From Robert Sampson, The Great American City: Chicago and the Enduring Neighborhood Effect (2012).
July 15, 2026 at 3:44 PM
People have studied this for decades, and the findings are pretty consistent: Immigration is unrelated or even negatively related to crime and cities w/lots of immigrants are likely safer than yours.
From Robert Sampson, The Great American City: Chicago and the Enduring Neighborhood Effect (2012).
From Robert Sampson, The Great American City: Chicago and the Enduring Neighborhood Effect (2012).
Reposted by Louisa Holaday, MD, MHS
In 1979, incarcerated men in NY analyzed the link between neighborhoods and incarceration, finding that 75% of NY prisoners came from 7 neighborhoods in New York City.
In a new paper, Jessica Simes, Ronald Day, and Louisa Holaday take a new look at the geography of incarceration. bit.ly/4v5bjJt
In a new paper, Jessica Simes, Ronald Day, and Louisa Holaday take a new look at the geography of incarceration. bit.ly/4v5bjJt
June 11, 2026 at 7:19 PM
In 1979, incarcerated men in NY analyzed the link between neighborhoods and incarceration, finding that 75% of NY prisoners came from 7 neighborhoods in New York City.
In a new paper, Jessica Simes, Ronald Day, and Louisa Holaday take a new look at the geography of incarceration. bit.ly/4v5bjJt
In a new paper, Jessica Simes, Ronald Day, and Louisa Holaday take a new look at the geography of incarceration. bit.ly/4v5bjJt
Reposted by Louisa Holaday, MD, MHS
It costs the City of Ottawa $465/person each year to serve new low-density homes, over & above what it receives from property taxes/fees.
On the other hand, high-density infill such as apartment buildings pays for itself plus an extra $606/person each year.
Sprawl costs, infill saves. #UrbanTruth
On the other hand, high-density infill such as apartment buildings pays for itself plus an extra $606/person each year.
Sprawl costs, infill saves. #UrbanTruth
Suburban expansion costs increase to $465 per person per year in Ottawa | CBC News
Infill development is known to be much cheaper for cities than adding new subdivisions, and City of Ottawa staff have shared estimates for how much the municipality saves — and spends — depending on w...
www.cbc.ca
April 15, 2026 at 8:07 PM
It costs the City of Ottawa $465/person each year to serve new low-density homes, over & above what it receives from property taxes/fees.
On the other hand, high-density infill such as apartment buildings pays for itself plus an extra $606/person each year.
Sprawl costs, infill saves. #UrbanTruth
On the other hand, high-density infill such as apartment buildings pays for itself plus an extra $606/person each year.
Sprawl costs, infill saves. #UrbanTruth
Reposted by Louisa Holaday, MD, MHS
I'm so jazzed to finally have this paper out with
@tagerai.bsky.social in @pnas.org! It's probably my favorite paper I've worked on so far. What happens when punishment is incentivized? 🧵
t.co/y5DUUGTdT9
@tagerai.bsky.social in @pnas.org! It's probably my favorite paper I've worked on so far. What happens when punishment is incentivized? 🧵
t.co/y5DUUGTdT9
https://www.pnas.org/doi/10.1073/pnas.2508479122
t.co
August 19, 2025 at 6:50 PM
I'm so jazzed to finally have this paper out with
@tagerai.bsky.social in @pnas.org! It's probably my favorite paper I've worked on so far. What happens when punishment is incentivized? 🧵
t.co/y5DUUGTdT9
@tagerai.bsky.social in @pnas.org! It's probably my favorite paper I've worked on so far. What happens when punishment is incentivized? 🧵
t.co/y5DUUGTdT9
Reposted by Louisa Holaday, MD, MHS
Spoiler alert: Making life livable reduces crime. popular.info/p/the-secret...
The secret to Baltimore's extraordinary year
This April, Baltimore saw five homicides.
popular.info
July 24, 2025 at 9:03 PM
Spoiler alert: Making life livable reduces crime. popular.info/p/the-secret...
Reposted by Louisa Holaday, MD, MHS
May 5, 2025 at 1:58 PM
Reposted by Louisa Holaday, MD, MHS
“By 2030, Paris will have removed 60,000 parking spaces and replaced them with trees. That’s one of the goals outlined in the French capital’s new 2024-2030 Climate Plan… #Paris promises to establish 300ha of new green space by 2030, with 10% in place by 2026.”
Leadership.
#ClimateCrisis
Leadership.
#ClimateCrisis
Paris to Replace Parking Spaces With Trees
The city’s new climate plan promises to drop speed limits, repurpose traffic lanes, remove 60,000 parking spots and create urban “oases” to combat extreme heat.
www.bloomberg.com
December 11, 2024 at 5:27 PM
“By 2030, Paris will have removed 60,000 parking spaces and replaced them with trees. That’s one of the goals outlined in the French capital’s new 2024-2030 Climate Plan… #Paris promises to establish 300ha of new green space by 2030, with 10% in place by 2026.”
Leadership.
#ClimateCrisis
Leadership.
#ClimateCrisis
Reposted by Louisa Holaday, MD, MHS
Denver gave people experiencing homelessness $1k/month. A year later, nearly half had housing.
They also had fewer ER visits, nights spent in a hospital, and jail stays.
The report estimates that this reduction in public service use SAVED the city $589k.
www.businessinsider.com/denver-basic...
They also had fewer ER visits, nights spent in a hospital, and jail stays.
The report estimates that this reduction in public service use SAVED the city $589k.
www.businessinsider.com/denver-basic...
Denver gave people experiencing homelessness $1,000 a month. A year later, nearly half of participants said they had housing.
Participants in Denver's basic-income program reported having more-secure housing, though results were similar in the trial and control groups.
www.businessinsider.com
November 26, 2024 at 12:47 AM
Denver gave people experiencing homelessness $1k/month. A year later, nearly half had housing.
They also had fewer ER visits, nights spent in a hospital, and jail stays.
The report estimates that this reduction in public service use SAVED the city $589k.
www.businessinsider.com/denver-basic...
They also had fewer ER visits, nights spent in a hospital, and jail stays.
The report estimates that this reduction in public service use SAVED the city $589k.
www.businessinsider.com/denver-basic...