Average 4.13 based on 48 teacher ratings
Gregg Kastanis is a Science teacher at John Jay High School located in Cross River, New York and part of Katonah-Lewisboro. Gregg Kastanis' 48 teacher ratings contributes to John Jay High School's ranking of 1,073 in New York. Additionally, the average teacher rating at John Jay High School is 3.98 stars.
3
Easiness
4
Helpfulness
4
Clarity
4
Knowledge
2
Textbook Use
3
Exam Difficulty
2
Effective
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Parent Relation
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Integrity
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Empathy
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Respect
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Determination
3
Homework

He did not help the students who were failing and he picked on certain people he is not the best teacher in my opinion

4
Easiness
5
Helpfulness
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Clarity
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Knowledge
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Textbook Use
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Exam Difficulty

THE MITOCONDRIA IS THE POWERHOUSE OF THE CELL

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Easiness
3
Helpfulness
4
Clarity
5
Knowledge
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Textbook Use
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Exam Difficulty

MR KASTANIS LOVE YEWWWWWW YOU DA BOMBBBBBB

5
Easiness
1
Helpfulness
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Clarity
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Knowledge

Mr. Kastanis needs to loosen up a bit. I threw a pencil in class and got detention, I felt it was very unreasonable. I think he should spend more time with the kids who need more help understanding science. I was one of the kids who had trouble and he just ignored me and let me suffer while the rest of the class was understanding and I wasn't. He rewards the smart kids and lets the dumb kids eat dirt. I think anyone who has him should watch out for impossible tests and 8 hour long study guides.

5
Easiness
3
Helpfulness
3
Clarity
5
Knowledge

He knows a lot and gives the hardest tests. He needs to get rid of the nicotine gum and curly pubes on his head. He needs to help other kids more and not favor the smart asses.

3
Easiness
5
Helpfulness
4
Clarity
5
Knowledge

Gives you a lot of tests and quizzes but teaches you everything you need to know for them and gives you study guides for all the tests. The class is hard but if you pay attention its a fun class

5
Easiness
5
Helpfulness
5
Clarity
5
Knowledge

OMG YALL MR KAY IS LIKE THE BESTEST TEACH IN DA HOOD! MY HERO!

5
Easiness
5
Helpfulness
5
Clarity
5
Knowledge

Best science teacher you will ever have. I am in Biology Honors and i still remember everything from his class. He is the man and the biggest bro in the middle school. You are lucky if you have him.

5
Easiness
5
Helpfulness
5
Clarity
5
Knowledge

The best overall teacher i ever had in science. I came out of that classroom with something new I learned every day and it helped me and I feel well equiped for highschool endeavors.

1
Easiness
5
Helpfulness
5
Clarity

good teacher

5
Easiness
5
Helpfulness
5
Clarity

Awesome science teacher. Hope your arm gets better.

5
Easiness
5
Helpfulness
5
Clarity

Great teacher great teacher great teacher

5
Easiness
5
Helpfulness
5
Clarity

AWESOME EXPERIMENTS!!!!!!!! <3 HIM

4
Easiness
4
Helpfulness
3
Clarity

Good teacher but sometimes picks on certain kids.

4
Easiness
4
Helpfulness
5
Clarity

KASTANIIII

5
Easiness
5
Helpfulness
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Clarity

i love u Mr. K! Ur awesome!

4
Easiness
5
Helpfulness
5
Clarity

MISTA K IS DA BEST

4
Easiness
4
Helpfulness
5
Clarity

Cool guy. Not the best, but his class is pretty fun.

2
Easiness
5
Helpfulness
5
Clarity

mr k is a tank his class is kinda hard but he's the man!!!!!!!!!!

4
Easiness
4
Helpfulness
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Clarity

not the best

4
Easiness
4
Helpfulness
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Clarity

One of the best teachers I've had yet, He is a tank

4
Easiness
2
Helpfulness
2
Clarity

Hes very nice but he favors people a bit and you can always tell if he doesnt like someone by the way he acts around them and its kinda hurftl thankfully im nopt one of the people he hates hurryyyyyy!

3
Easiness
5
Helpfulness
3
Clarity

Mr. K is one of the best teachers I've ever had. He challenges you, and makes you think at a higher level than any other teacher. He can be tough sometimes, but if you listen his tests are very easy.

2
Easiness
4
Helpfulness
5
Clarity

Mr. K is a nice guy. If u get on his good side, he will love u 4ever.

3
Easiness
4
Helpfulness
3
Clarity

Very hard and has favorites which is no fair

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Easiness
4
Helpfulness
4
Clarity

mr. kastanis is the nicest teacher in the WORLD. he is my FAVORTIE TEACHER..he teachers really advanced stuff, but helps you understand it 100%. HARD GRADER, BUT SOOOOOOOOOOOOOOOOOOO NICE!

2
Easiness
4
Helpfulness
3
Clarity

3
Easiness
5
Helpfulness
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Clarity

Listen. i don't know what you people are talking about. Mr.k is awesome. he like nevers give's homework and is a kinda hard grader but he is a great teacher. you just have to study and you'll do fine!

5
Easiness
5
Helpfulness
5
Clarity

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Easiness
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Helpfulness
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Clarity

He is nice, but his homework is hard, and he is a kinda hard grader.

1
Easiness
5
Helpfulness
4
Clarity

Mr. K's the funniest science teacher i have ever had! He teaches the stuff sooo good and always makes me understand. i think hes the coolest guy!!

3
Easiness
4
Helpfulness
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Clarity

mr. k is the coolest!

2
Easiness
5
Helpfulness
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Clarity

Mr. kastanis is nice but is a REALLY hard grader, I love his turtle!!!!

2
Easiness
3
Helpfulness
2
Clarity

mr. k is so cool, but he taught us 10th grade stuff in 8th!

3
Easiness
1
Helpfulness
3
Clarity

he is such a tuff grader!

3
Easiness
5
Helpfulness
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Clarity

he's hard he's cool he's mr. k

2
Easiness
3
Helpfulness
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Clarity

He was semi-nice but very hard and did not expalin things after you asked.

1
Easiness
2
Helpfulness
2
Clarity

Mr.K is a nice teacher but he is extremely hard! he grades hard and if you are failing he doesnt lift a finger to help you. i like him but i dont..ya know?

4
Easiness
5
Helpfulness
5
Clarity

he's ok he expects alot and likes to pick on us and he's a really hard grader.

3
Easiness
5
Helpfulness
5
Clarity

Mr. K is the best if u get on his good side. Trust me u don't wanna know the other one!!

1
Easiness
5
Helpfulness
3
Clarity

Mr. K clearly has students he likes or dislikes. He's a great teacher, just a wicked tough grader

1
Easiness
2
Helpfulness
3
Clarity

Mr. K is cool, but he expects a LOT from us and he grades us way too hard...and the lessons are so BORING!!! When he's in a good mood he can be awsome, though.

3
Easiness
3
Helpfulness
3
Clarity

cool but sometimes works us too hard

3
Easiness
4
Helpfulness
3
Clarity

he is nice but hard!

4
Easiness
5
Helpfulness
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Clarity

expects alot !!

5
Easiness
5
Helpfulness
5
Clarity

VERY COOL!!

2
Easiness
5
Helpfulness
5
Clarity

Mr. K is only being honest with his students. If someone doesn't work very hard he tells them. How else will they learn effort is important.

5
Easiness
5
Helpfulness
5
Clarity

I don't know what you guys are talking about-I had Mr. K when it was his first year-and he rocks!!! He was always to nice to EVERYONE, and taught really well!!! Mr. K was awesome!!!

2
Easiness
2
Helpfulness
3
Clarity

MR kastanis is okay, he kind of makes fun of the kids, but i think its just his sense of humor. He liked me, so i had a good year, but i saw that he didnt treat other people so well...

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Learn more about John Jay High School

5-star
73%
4-star
11%
3-star
7%
2-star
3%
1-star
4%
Based on 2,150 Ratings
John Jay High School is a public middle school located in Cross River, New York and part of Katonah-Lewisboro. John Jay High School is ranked 1,071 in New York. Learn More