Tom Seibel
Early Math, Algebra, Geometry, PreCalculus, 
ACT and SAT prep
Tom's office hours:
Second Semester: January 7 to May 21

Monday - Thursday    2:15 pm - 8:30 pm
Friday                             2:15 pm  - 6:30 pm
   Saturday                      11:00 am - 4:00 pm
 Den Ducoff  
Algebra, PreCalculus, Calculus

Den's office hours:
Year-round hours 

 Monday - Thursday   4:00 pm  - 8:00 pm
Gary McBride
Early Math, Algebra, Geometry, PreCalculus, Calculus, ACT and SAT prep

Gary's office hours (North Boulder):
Second Semester: January 9 to May 25
   Monday            1:00  pm - 8:30 pm
Tuesday            1:00 pm - 8:30 pm

Wednesday     1:00 pm - 8:30 pm

   Thursday         1:00 pm - 8:30 pm
Liza Dombrowsky
Early math, Pre-algebra, Algebra,  Geometry, Precalculus, Calculus, Statistics, Chemistry, French, Essay crafting, Psychology, Anthropology, Business, ACT and SAT Test Prep


Liza's office hours:
Second Semester: January 9 to May 25
   Monday            1:00  pm - 8:30 pm
Tuesday            1:00 pm - 8:30 pm

Wednesday     1:00 pm - 8:30 pm

  Thursday         1:00 pm - 8:30 pm

Den Ducoff started tutoring me in math after I had dropped College Algebra due to a failing grade. With Den's help and encouragement I took the class again and finished with a solid B+. He continued tutoring me in college-level trigonometry, calculus, and physics. I did well in all of those classes and I don't know what I would have done without his help. Den's passion for math and patience with students make him a great tutor.

-Erik B 

Den Ducoff is a gifted tutor who worked with me through high school and middle school mathematics. He is incredibly patient, which was always an important factor when I got frustrated with a problem. Calmness is definitely a virtue! He truly cares about the progress of his students and is genuinely happy in light of their success. It was also refreshing to see different ways of working through a problem. 
In all, I highly recommend Den as a tutor in any and all subjects he knows. 

-Rebekah Percy
                                                                 (larger view
                                              Artwork by Rebekah Percy

Den helped my Rebekah daughter with her math classes for several years during Middle School and High School.  Not only was he able to help her understand the concepts and ideas that had eluded her in class, he addressed her issues of confidence and self-confidence.  She eagerly looked forward to her sessions with him, and returned from them with a lighter step and a smile..and much better grades on her tests!

-Mary Ann Percy,  Rebekah's mom

I was taking a geometry class and was not going to pass.  Den and I worked hard together for about 3 or 4 weeks and I was able to pass my class.

- Yuri B

Thanks to Den Ducoff, my son Yuri passed high school Geometry. I think the highest praise I can give is to simply say that my son loved going to Den's house for the tutoring sessions and needed no coaxing from me. I know from experience that my son is not an easy student to work with, but Den persevered and was able to reach him. Passing the class was no small feat since Den began working with him near the end of the course after we realized he was failing. Thank you, Den, a true lover of mathematics!

- Marilyn F., Yuri's mom

When I was in school I always had a hard time with math. It always was a struggle, I was very fortunate that Den was there to help me. Den helped me understand math from a different perspective that was more understanding. I thank him gratefully for his help because I was able to pass math. Therefore this helped me establish a positive realm for math that will continue on.

- Brianna B.