Mathnasium 1205 Johnson Ferry Rd, #135, Marietta GA 30068 (770) 578-6170

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Our Team

Our specially trained math instructors will teach your child how to understand math in an individual setting; our unique approach enables us to explain concepts really well and lend a helping hand to every student. Our tutors foster a caring, encouraging environment that helps kids thrive and learn! Read below to learn more about our talented team:

Melanie Staus, General Manager - Education

Melanie graduated from Washington University in St. Louis in 1996 with a Bachelor of Arts degree in Mathematics/Secondary Education. Melanie graduated with honors and is a member of Phi Beta Kappa, the nation's oldest and largest academic honor society. She spent ten years in the benefits consulting industry performing actuarial work and overseeing the administration of pension plans for several Fortune 500 companies. Melanie has done extensive math tutoring for all ages and in all subject areas and is thrilled to share her passion for teaching and love of mathematics!

Justin Staus, General Manager - Operations

Justin graduated from the University of Missouri: St. Louis in 1996 with a Bachelor of Science degree in Economics. He has spent over nine years in the banking and employee benefits industry developing and marketing products to Fortune 1000 companies. Justin loves playing soccer and has also coached several youth teams in Missouri and Georgia. Melanie and Justin are the proud parents of a 12 year old boy, Tanner, and 9 year old girl, Avery. They understand the importance of developing "Number Sense" and look forward to bringing the Mathnasium Method to your children.

Betsie Last, Center Director

Betsie graduated from the University of Tampa in 2014 with a Bachelor of Science in Mathematics and completed her Master of Science in Statistics at Georgia Tech in 2016.  While completing her degrees, she has worked in education including as an instructor at the Mathnasium of South Tampa.  Betsie has a passion for animals and spends her free time volunteering at the Georgia Aquarium.  She is happy to be back with Mathnasium and is looking forward to sharing her love of mathematics.

Karishma Naik, Assistant Center Director

Karishma graduated from Kennesaw State University in 2014 with a Bachelor of Science in Mathematics.  She first began her time with Mathnasium as a student, attending while in high school.  Karishma returned to Mathnasium of West Roswell as an instructor in 2015, transitioning to lead instructor later that year.   Karishma is a big supporter of Atlanta sports team and loves to attend as many games as possible.   She loves building relationships with the students and witnessing their growth while at Mathnasium.

Andi Castillo, Lead Instructor

Andi graduated from Kennesaw State University in 2018 with a Bachelor of Science in Biology.  She started at Mathnasium as an instructor in 2017 and became lead instructor in May of 2019. Andi recently got married and enjoys spending time with her husband and their new French Bulldog puppy, Bruno. She is happy to be a part of the Mathnasium family and loves seeing kids transform not only in their math abilities but in their confidence as well.