I am involved with the following math competitions:

MATHCOUNTS (US middle school math competition)

I am on the Question Writing Committee for MATHCOUNTS (2021-2023) and was previously a National Reviewer (2019-2020).  My favourite problems that I have written for them are not public at the moment.

ARML (US high school team math competition, taking place at four different sites).

I am on the Problem Writing Committee for ARML (2020-present) and I was involved with ARMLocal 2019 (their local competition). I was also the moderator at the UNLV site for the 2023 competition. Some of my favourite problems that I have written for ARML are below:

(ARMLocal 2023 Tiebreaker): Let $f(k)$ be the maximum value of $y^2$ over all real numbers $x,y$ such that $ky^2 + 2xy\leq -\frac{1}{k+1}$ and $(k+1)y^2 + x^2 = 1$. Compute $f(44) + f(45) + \cdots + f(2022) + f(2023)$.

(ARMLocal 2023 Team 9): In $\triangle ABC$, let $D,E,$ and $F$ be the midpoints of $\overline{BC}, \overline{AC},$ and $\overline{AB},$ respectively. The circumcircles of $\triangle AEF$ and $\triangle BDF$ intersect at a point $G\neq F$. Given that $AB = 12, BC = 10,$ and $CG = 15,$ compute the sum of all possible values of $AC.$

(ARMLocal 2023 Individual 6): Let $\triangle ABC$ be acute with $AB = 8$ and $AC = 5$. Suppose $D$ is the intersection of the internal angle bisector of $\angle A$ and the altitude from $B$ to $AC$. Let $F$ be the circumcenter of $\triangle ABD$. Suppose that $F'$, the reflection of $F$ over $\overleftrightarrow{AB}$, lies on the circumcircle of $\triangle ABD$. Compute the perimeter of $\triangle ABC$.

(ARML 2022 Individual 4): Let $n$ be the number of ordered quadruplets $(A,B,C,D)$ such that each of $A,B,C,$ and $D$ is a subset of $\{1,2,3,4,5,6\}$, $A\cap B$ is a subset of $C\cap D$, and $A\cup B$ is a subset of $C\cup D$. Compute $n$.

(ARMLocal 2021 Team 15): Compute the sum of all positive integers $n\leq 50$ such that $n^4 + n^2 + 1$ is divisible by a perfect square other than $1$.

AMC 10/12 and AIME (US high school competitions used to eventually determine the team for the International Math Olympiad)

I am on the editorial boards for AMC 10/12 and AIME (both 2023-present).