19 years as a UX Leader (Microsoft, Expedia, Sage + Consulting). Los Angeles
Santa Monica, CA
Joined March 2009
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Jay Eskenazi Ph.D. retweeted
On Sunday, @seattletimes reporters Daniel Beekman (@DBeekman) and Ryan Nguyen wrote: "There is no serious scientific evidence that trans girls or women are better athletes than cisgender girls or women."
That claim doesn't hold up. I say that as a Washington-licensed medical provider who specializes in sports medicine.
Start with testosterone. It's a performance-enhancing drug. The World Anti-Doping Agency bans exogenous testosterone at all times as an anabolic agent. Before puberty, boys and girls have the same testosterone levels, under 20 ng/dL, and perform about the same. But according to the National Institutes of Health, male puberty can begin as early as age 9, around 3rd or 4th grade. By mid-puberty, a boy's testosterone can reach 800 ng/dL, and by late puberty up to 1,200, which is already at or above the adult male range of 240–950. Adult women run 8–60 (Mayo Clinic Laboratories). Male puberty multiplies testosterone production about 30-fold, and the athletic gap opens at age 12–13 in step with it. Adult men end up ~10–12% better in running and swimming and ~20% better in jumping (Endocrine Reviews, 2018; Clinical Endocrinology, 2017). That's why this matters in middle and high school, not just college.
"Hormones fix it"? The research says otherwise. A Sports Medicine review found muscle mass and strength fell only about 5% after 12 months of testosterone suppression. A U.S. Air Force study in the British Journal of Sports Medicine found trans women were still 9% faster in the 1.5-mile run after one year of hormones and 12% faster after two. A systematic review in the same journal found strength, lean mass and muscle area stayed above female levels even after 36 months.
Sports governing bodies have drawn the line at male puberty. In March 2026 the IOC limited the female category to biological females, citing the "scientific consensus that Males have a performance advantage in all sports and events that rely on strength, power and/or endurance irrespective of subsequent testosterone suppression." World Athletics (2023), World Aquatics (2022), cycling's UCI (2023) and the NCAA (2025) made similar moves.
"None have dominated"? Lia Thomas won the 2022 NCAA Division I 500-yard freestyle. CeCe Telfer won the 2019 NCAA Division II 400m hurdles. Each of those wins was a podium spot a woman didn't get.
Researchers can debate how large the gap is. But "no serious scientific evidence" is not an honest summary of this body of work. Girls deserve a fair race, and Washington voters said so when they passed I-638. Sources in the reply 👇
Jay Eskenazi Ph.D. retweeted
Grok Bot will now warn you about hidden instructions. This one is a really big one
If a page or a message tries to inject hidden text into your chat, the bot surfaces a warning and does not follow those instructions. Ask about a store's return policy, and if that page tries to sneak in commands for SI agents, Grok Bot answers your actual question and flags what it found
A simple, important security habit, built right into the Grok Bot... That's how you know how powerful Grok Bot is and how capable it really is
Jay Eskenazi Ph.D. retweeted
Andrew Hartz (@Hartz_PhD) and I exposed the ideological takeover of the @APA in the @WSJ by sharing the totally absurd program of one of their Spring 2026 conferences.
The president of APA Division 39 responded in a letter to the WSJ, but ignored every substantive criticism we raised. Instead, she defended the overtly political nature of the conference political by arguing that therapists must address oppressive systems and power dynamics "within and beyond the consulting room."
But her response illustrated the very problem we were exposing.
When therapists view mental health problems primarily or entirely as products of oppressive social systems, the focus of therapy moves away from helping patients improve their own lives and toward changing society itself.
The role of the therapist is no longer to help someone navigate life's difficulties but to become (and encourage their patients to become) activists fixated on dismantling the political and social structures that are supposedly causing so much psychological harm.
This approach to psychotherapy isn't merely wrong, it can actively harm patients by convincing them that their problems are beyond their control and that meaningful improvement must wait for the revolution to succeed.
In our new @CityJournal essay, we explain why the APA's leadership has lost sight of who therapy is supposed to serve, and why its growing political activism should concern everyone.
Read our full response here:
🔗city-journal.org/article/ame…
Jay Eskenazi Ph.D. retweeted
Seattle’s socialist mayor has thrown her support behind the effort to undermine the democratic vote of Washington state residents who overwhelmingly approved a measure that would keep female school sports female.
Jay Eskenazi Ph.D. retweeted
The ACLU is suing Washington to override the will of the people and to take away fair and safe competition for girls.
I can't believe I used to give money to this organization.
Jay Eskenazi Ph.D. retweeted
Democrat Seattle congresswoman @PramilaJayapal suggests she will work to overturn the will of liberal voters in Washington state after a measure to keep female school sports female overwhelmingly passed.
"We are going to take our state back,” she said. “We're going to start planning for how we overturn these bad initiatives and how we go back to loving everyone with gender inclusivity the way we have for decades.”
Jayapal, a woke activist, has an adult son who identifies as trans. Jayapal refers to him as her “daughter.” ngocomment.com
Jay Eskenazi Ph.D. retweeted
My old shop, the Seattle Times, actually published a piece claiming there's "no serious scientific evidence" trans women are better athletes than biological women. It's another example of a paper that has abandoned journalistic integrity for activism.
foxnews.com/outkick-sports/s…
Jay Eskenazi Ph.D. retweeted
This is what people are tired of.
School boards, government officials & corporate execs making back room deals and telling voters & everyday folks they are just too dumb to understand that boys can actually become girls with the wave of a wand. So they -- the elites -- will decide for the people.
The people know better and they are absolutely sick of it.
Tonight the Seattle School Board voted unanimously to fight I-638, a measure Washington voters just passed.
They talked it over behind closed doors, then came out and voted against the voters.
So I said it to their faces:
"35 counties said YES. King County doesn't get a veto!"
One school board doesn't get to overrule the rest of the state. Respect the vote.
Justice delayed is justice denied. 638 NOW.
#638NOW #RespectTheVote
@thehoffather @BrandiKruse @bethsd @WestCoastTerf @JenniferSey @letsgowa @SeaPubSchools
Jay Eskenazi Ph.D. retweeted
asked my russian gf (who is way out of my league) if she is secretly a spy after the jensen news
she laughed hysterically for a few, paused, and then said:
"you trade animal coins with retarded ppl on the internet"
somehow this is even worse than if she were a kgb agent
Jay Eskenazi Ph.D. retweeted
$100M for SF parks from @bchesky, the largest single-donor gift in history
He has expressed interest in doing more.
This is awesome, thanks Brian!
sfchronicle.com/sf/article/a…
Jay Eskenazi Ph.D. retweeted
Cool! Kudos to @bchesky. sfchronicle.com/sf/article/a…
Jay Eskenazi Ph.D. retweeted
Credit to @bariweiss for realizing that @Douthat60 would be a fantastic asset to @CBSNews, and securing the interview.
And obviously @Douthat60 for finally giving the world an interesting conversation with the president. 👏🏻👏🏻👏🏻
My extended interview with President Trump:
youtube.com/watch?v=m2aC8lAO…
Jay Eskenazi Ph.D. retweeted
Where are the apologies to @bariweiss?
Every honest person knows that this Trump interview was 100X more intelligently and non-partisanly skeptical, and all around superior to anything the old CBS would have produced.
Jay Eskenazi Ph.D. retweeted
Updated @Tesla Robotaxi geofence sizes (in square miles):
• Austin: 443 (63% increase today)
• San Antonio: ~275 (New city launch today)
• Houston: 254
• Fort Worth: 143
• Dallas: 81
• Miami: 31
• Orlando: 26
• Tampa: 24
All of these areas are fully autonomous/unsupervised robotaxis only.
Jay Eskenazi Ph.D. retweeted
The richest man in the world spent his Sunday doing customer support.
For real.
A Grok Bot user replied to Elon Musk with a very specific problem. His $200 plan had lasted a full week of heavy use the week before. This week it was gone in 14 hours.
At most companies, the CEO never sees a message like that. It lands in a ticket queue, gets a template reply, and quietly dies there.
Elon Musk answered: "I will dig into this today."
Sixteen minutes later: "Grok Bot fixes for improved token efficiency and smarter behavior are underway."
Then, that night:
"Just did a round table review with the Grok Bot engineering team. Fixes are being implemented overnight and you should notice a dramatic improvement by tomorrow. If not, reply to this post and we will address any remaining issues right away."
Someone joked that it will never stop being funny how much time Elon Musk spends as a customer service agent for his own companies.
His answer was two words.
"I care."
People laugh because they think this is beneath him. Look closer and you see how he has always run his companies.
December 2016. A French entrepreneur, Loïc Le Meur, tweets at Elon Musk that the San Mateo Supercharger is always full of Teslas that finished charging hours ago.
Elon Musk replies within minutes: "You're right, this is becoming an issue. Supercharger spots are meant for charging, not parking. Will take action."
Six days later, Tesla rolls out an idle fee across the entire Supercharger network.
Ten years apart. Same reflex.
Every layer between the customer and the person who decides is a filter. Support filters for the manager. The manager filters for the VP. The VP filters for the board deck. By the time the problem reaches the top, it's a smooth line on a chart and nobody feels it anymore.
Elon Musk deletes the layers. He reads the raw signal himself, in public, with the whole world watching.
For a normal CEO that's terrifying. Every promise is on the record. Every "fixed by tomorrow" can be checked by tomorrow.
Public accountability compresses time. A fix that drifts for a quarter somewhere else gets shipped overnight, because the boss said overnight and everyone heard him.
And read that last line again. "Reply to this post." He just turned his replies into the biggest QA team on the planet.
Now zoom out.
We're entering the era where AI agents do real work for billions of people. They research, they buy, they run errands and small businesses. Soon, with Optimus, they'll move things in the physical world.
In that world the company that wins is the one with the shortest distance between a user's frustration and an engineer's keyboard.
Elon Musk has been shrinking that distance for twenty years. Teslas get better while parked in your garage, and now an AI gets fixed while its users sleep.
Jay Eskenazi Ph.D. retweeted
Tesla's Unsupervised Robotaxi service is now available in 8 cities as of Nov 9th. The expansion into San Antonio today marks @Tesla's largest-ever Robotaxi service area at launch.
Updated geofence sizes (in square miles):
• San Antonio: ~275 (launch on Nov 9)
• Austin: 272
• Houston: 254
• Fort Worth: 143
• Dallas: 81
• Miami: 31
• Orlando: 26
• Tampa: 24
