Our Team

David Zhang


David Zhang is a sophomore at Dougherty Valley High School. He is a 4-time AIME qualifier and 3-time USAJMO qualifier, and he achieved perfect scores on the AMC8 in 2019 & 2020. He placed 1st in California’s MATHCOUNTS State Competition in 2021, and advanced to the National MATHCOUNTS Competition. He was the 1st place individual at BmMT 2021. Outside of math, he is also a USACO Platinum Division contestant since 2021. He has taught several AMC and AIME classes at Cowconuts.

Brian Li


Brian Li is a rising Junior at Mission San Jose High School and is an avid competitor in various STEM fields. He qualified for AIME multiple times while earning a perfect score on the AMC10 and Distinguished Honor Rolls on both the AMC10 and AMC12 twice. Brian also qualified for the 2021 USAMO and was a 2022 USAJMO Honorable Mention. He participates in quite a few college-run competitions, such as CHMMC where he placed 11th individually, and BMT where he tied for 7th in algebra and 8th in geometry. Brian’s teams have ranked in various competitions, including 2nd in CMIMC and 5th in CHMMC. Besides math, Brian enjoys science fairs, physics, and computer science. He is a 2022 USAPHO Honorable Mention, a 2-time Broadcom MASTERS, a Broadcom semifinalist, and in the USACO gold division. Overall, Brian wants to allow others to feel passionate about math and help both his students and himself grow in the process.

Andrew Wen
(Advisor and Former President)

Andrew is a senior at Phillips Academy in Andover, Massachusetts and has been an avid participant in math competitions since 6th grade. He is a 6-time AIME qualifier, a 4-time USAMO/USA(J)MO qualifier, and a MOP qualifier in 2021. In addition to American competitions, Andrew also competes in Canadian and International Olympiads with winning a Silver Medal in Asia Pacific Mathematics Olympiad (APMO) in 2022.

Andrew really enjoys writing math problems in his free time. He has donated plenty of problems to his school’s math competition and other math competitions/mocks on AoPS that he ran with his friends. He is looking forward to sharing his passion and intriguing ideas with the community.

Emma Li
(Vice President, Math)

Emma is a rising junior at Mission San Jose High School. She is a self-driven STEM girl who is particularly passionate about competition math. Emma is a two-time Math Prize for Girls qualifier, a two-time AIME qualifier, AMC 10 DHR, and an AMC 8 perfect scorer. She placed 3rd individual and 1st in the team category in her Mathcounts Chapter and won 7th place in her grade for Mathleague national championships. Additionally, Emma has competed in quite a few girls math competitions, placing in the Top 3 Individual for Girls in Math at Yale 2022. Besides participating in math contests, Emma also has experience as a teacher of AMC8 and AMC10 classes, and as a problem writer for local math competitions. Outside of competition math, Emma enjoys physics, coding, and participating in science and engineering fairs. She is a USACO Gold Division contestant, as well as a two-time Broadcom MASTER and a Broadcom semifinalist. She looks forward to passing down her knowledge and experience to younger students, especially girls, and inspiring them to pursue interests in STEM.

Baiyu Zhu
(Vice President, Physics)

Baiyu Zhu (Bob) is a rising Senior at California High School. He is passionate about physics, college math, and chemistry. He is a 2022 US Physics Team member and qualified for the USNCO national round. In school, Baiyu is the vice president of physics club and is in charge of teaching physics competition concepts and became a Cowconuts physics teacher since 2021 winter. He is knowledgeable about questions ranging from USAPhO, IPhO, CPhO, and APhO. He explains physics concepts from the root and can come up with good physics problems. He enjoys teaching other students and is currently writing handouts for physics competition to be released publicly. 

Baiyu is active on the physics olympiad discord server to talk about physics problems.

Abrianna Zhang
(Web Master)

As of 2021, Abrianna Zhang is a rising Junior at Foothill High School. She’s an avid learner with a passion for math and teaching. She has represented her middle school multiple times as a member of the Mathcounts team and is currently a Mathcounts coach. She has participated in numerous competitions, among which she won third prize for the 2021 Girls in Math at Yale’s competition. Being an AIME qualifier, she has ample knowledge and experience for taking AMC competitions. With this opportunity, she aims to create an enjoyable and enriching environment for budding mathematicians.

Kevin Jiang

Kevin is a rising Junior attending Mission San Jose High School. He has attended numerous math competitions since he was in elementary school, qualifying for MathCounts State twice, getting Distinguished Honor Roll on the AMC 8 three times, and qualifying for AIME in 2020 and 2021. Along with his competition experience, Kevin also enjoys giving back his knowledge to the community by teaching classes. He has been teaching middle schoolers basic AMC 8 and 10 materials and AoPS geometry since 2019 and leading weekly reading clubs and numerous math circles, allowing him to earn the gold Presidential Volunteer Service Award medal. Additionally, he has also co-led the 2nd Annual MPTF Math Competition, as well as part of the problem writing committee for the Cowconuts competition. He wishes to spread interest for math throughout the community, making math not a subject people fear but a subject people love.

Hunter Bian

Hunter is a rising Sophomore at Dougherty High School. He started doing competitive math in 6th grade like Math Olympiad and Mathcounts. Some of his achievements are getting to the state level in Mathleague, 24 on the AMC 8 in 2019 and AIME qualifying in 2021. He has also tutored some younger students in math and Chemistry; and he hopes he will be able to teach better through Cowconuts. Other than doing math, he likes to swim on weekdays at PLS

Henry Yao (Tutor)

Henry is a freshman at Dougherty Valley High School. He started to participate in math competitions in 5th grade. He qualified for California’s MathCounts State Competition in 2022, and AIME in 2021. He is also a 2-time Mathleague National qualifier. He loves to share his passion for math with other people. Outside of math, he also enjoys playing soccer and doing community services.