Jukka is probably the best professor I have ever had at UCLA. His lectures are engaging, he clearly loves teaching, and he provides the most academic assistance I have ever seen from a professor. He holds multiple hours of office hours every week and hosts two review sessions before each exam. He is very adamant on ensuring that all students in the class do well and are actually learning the material as well. If I could take another class with Jukka, even if it's not math, I definitely would.

tl;dr: Jukka is the goat

Keranen is an absolutely amazing professor. There's no reason to hesitate when picking Keranen. If you can take him, DO IT. Decently easy A and you also learn a lot.

Really good and passionate professor. I think he was one of the best professors who motivated me to do things for this class. His grading scheme is very forgiving, and i would definitely recommend for a class like this. He has a lot of office hours that are available, his midterms are just like he says they are and its just a good class to be in. I found this to be a useful class.

Jukka is the best mathematics professor I've had at UCLA, and is in my top three across the entire school. He is extremely well-prepared, does a great job explaining the complex topics brought on by an upper-division linear algebra course, and has a wonderful personality. He holds several office hours each week, including one on Sunday and extra review sessions before exams, to help assist with the weekly homework assignments and to answer questions about the subject matter.

Each of our two-hour lectures opened with an extensive review (sometimes taking up to a third of the total class time) of the previous material to make sure everyone was staying up to date and following along. After that, we went through two slide decks with a short break in the middle. The slides were published the evening before so we could prepare before coming the next day. After class, our one-hour discussion section went over some additional practice problems in order to get some hands-on work with the material. At the end of each day, we needed to submit a class reflection, detailing the new content we learned and giving us an opportunity to recall everything so that it stays fresh.

The class was not too difficult, but it also did require quite a bit of work. Even though the class is condensed into six weeks, rather than ten, we still covered every single slide that would have been presented in the ten week course. Jukka helpfully left the last unit (on inner products) off the exam to give us a chance to study for a full week.

We had one midterm exam, attendance was required, and the biweekly discussions had a worksheet submission. There were ten homework problems a week, not taking more than a couple hours in total.

Professor Jukka is by far the best professor I have ever had within the two years of college so far. Before enrolling in his class, a lot of my peers have offered very positive feedback about him and his reviews on Bruinwalk was also very assuring. However, it was my experience in this class that I realized how amazing of a Professor he is and how helpful of a resource he becomes for us students.
Beginning of the summer session A, I met with him and discussed about dropping out due to the difficulty of the class; however, he reassured me and offered to take time out of his day to meet with me for a tutoring session to help make sure I understood the class materials. Not only did he went beyond his ways to help me, but he was very communicative and held many, many review sessions and office hours to answer our questions and make sure we were fully prepared for the exams.
Additionally, Professor Jukka is great at teaching the course materials as he's very clear and goes at a good pace for everyone to understand. Unlike some professors I've taken, he's willing to make sure that no students fall behind and that they can be comfortable to ask any questions.
I am truly thankful that I got to enroll in one of Professor Jukka's class because it was very eye-opening and I am very, very appreciative of his unwavering support to make sure his students succeed in his class. Without him, I would have most likely dropped out of Math 115A and probably struggled worse with another professor so I am truly grateful for Professor Jukka. He is an amazing professor and individual and I hope to be able to take more upper div classes with him in the future and I hope many students can experience the wonderful learning experience that I got with Professor Jukka.
I know he can't see this but I want to thank him very much and that words can't describe how grateful I am. The UCLA Math department is very lucky to have a professor like him and I wish him the best of luck!

Jukka is the -best professor. Take him and you don't have to worry about one single thing.

Take 115A with Jukka. He has an awesome personality, clear lectures, and straightforward tests with LOTS of officer hours and review sessions. I got a C in 33a and didn't remember much about linear algebra but that didn't matter. Jukka starts fresh and makes it alot less intimidating. Attendance was mandatory but I didn't even mind going to every one. The small classroom size also completely changes the dynamic for the better.