Contact 
Calendars
Careers
Engage 
District
Third grade students learn about Ecosystems and Simple Machines in science. The students will visit the outdoor lab for the first time, to enhance their learning about simple machines. In social studies, they learn about 5 important Ancient Civilizations: Egypt, China, Rome, Greece, and Mali. It is a big year for mathematical learning! Students learn everything from place value for numbers up to 6 digits, to multiplication, to geometry. In Reading, students make a shift from learning to read, to reading to learn- with a big focus on comprehension skills in both fiction and non-fiction. Near the end of the year, students take SOL’s for the first time in reading and math. The third grade team works collaboratively with the math coach and reading team to ensure student growth and learning. Students in third grade also learn a variety of new concepts in the arts and physical education including playing the recorder and taking swimming lessons.Through the six transdisciplinary themes Third grade students learn about the concepts of cycles and systems studying simple machines, ecosystems and water. Students will visit the outdoor lab for the first time. This exploration will also look at ancient world civilizations and ask students to make connections to the present day.It is a big year for mathematical learning! Students learn everything from place value for numbers up to 6 digits, to multiplication and division, to geometry. They create and solve practical problems using all four operations. Students in grade 3 explore fractions concepts more deeply and begin to add and subtract fractions with like denominators. They also explore numerical and geometric patterns and explore the concept of equality in depth.In Reading, students make a shift from learning to read, to reading to learn- with a big focus on comprehension skills in both fiction and non-fiction. Near the end of the year, students take SOL’s for the first time in reading and math. The third grade team works collaboratively with the math coach and reading team to ensure student growth and learning. Students in third grade also learn a variety of new concepts in the arts and physical education including playing the recorder and taking swimming lessons.
Ms. Brizeyda Argueta, 3rd Grade Teacher
Email: [email protected]
Ms. Brizeyda Argueta is a third-grade teacher at Randolph Elementary. She was born in San Miguel, El Salvador. Before Randolph, Ms. Argueta was the Assistant Supervisor in Extended Day at Glebe Elementary. She attended George Mason University, where she received her bachelor’s degree in Elementary Education (PK-6) and a minor degree in Childhood Studies. She is currently pursuing her master’s degree in Education with an emphasis in Curriculum and Instruction. She loves spending time with family and friends. She is looking forward to a great school year!
Isabella Lundgren, 3rd Grade Teacher
Email: [email protected]
Hi! My name is Isabella Lundgren and I am thrilled to be a 3rd grade teacher at Randolph this year. I graduated from the University of Dayton in 2025 with a degree in Early Childhood Education. My goal is to help students become kind, empathetic, lifelong learners. I’m grateful to have the opportunity to work with such an incredible group of people at Randolph. In my free time, I love to spend time with family, friends, and my puppy June. I enjoy reading, camping, and doing puzzles. I am excited to learn with and also from your students!
Leo Ribeiro, 3rd Grade Teacher
Email: [email protected]
Leo is excited to return to Randolph Elementary School as a third grade teacher. Born and raised in Brazil, he moved to Arlington in 2007 and has proudly called it home ever since. With experience in both general and special education across public and private schools in Maryland and Northern Virginia, he is dedicated to supporting the whole child through inclusive, student-centered classrooms where every child can thrive, and he values strong collaboration with families and colleagues to ensure student success. Leo holds a Master’s degree in Education with a focus on Curriculum and Instruction. Outside of school, he enjoys cooking, hiking, traveling, and spending time with family, friends, and his two cats.
Karina Fasullo, EL Teacher
Email: [email protected]
Karina Fasullo is a National Board Certified educator with 20 years of experience fostering student growth and enthusiasm for learning. Passionate about supporting multilingual learners through culturally responsive teaching and evidence-based literacy practices, she creates an engaging and inclusive classroom environment where every student can thrive.Karina holds a Master’s degree in Education from the University of Virginia and is committed to ongoing professional development to bring best practices—especially in language development and literacy instruction—into the classroom. Outside of teaching, she enjoys spending quality time with her husband and two young children, running, and traveling.Karina looks forward to a fantastic year of learning, growth, and collaboration with students, families, and colleagues.
Ms. Kerri Martin, Reading Specialist
Email: [email protected]
Kerri Martin is a Reading Specialist at Randolph Elementary. Prior to working at Randolph, she ran Book Buddies for multiple APS elementary schools. Kerri has a Masters of Education from UVA and completed her undergraduate work at the University of Dayton. In her free time, she likes to spend time with her family, get outside, and of course, READ!
Grades 2-3 Resource Hub
Emily Jones, Sped Resource Teacher
Email: [email protected]
I am beyond lucky to have the best job in the world! For the last five years, I taught in non-public schools for students with special needs. I loved teaching all the subjects (especially reading) and helping out during P.E. and art classes. I am eager to join the Randolph community and work in an IB school because the students, families, and staff are the best! When I am not at school, I love being outside, walking my two little dogs, and working on jigsaw puzzles. I can’t wait to get to know all of you!
Elizabeth Hartenburg, Sped Resource Teacher
Email: [email protected]
Libby Hartenburg is so excited for her first year of teaching at Randolph Elementary as a 3rd Grade SpEd teacher! Libby Hartenburg graduated from the University of Dayton with a degree in PreK-5th Grade General Education and PreK-5th Grade special education. Outside of teaching, she enjoys going on hikes, reading and spending time with her friends and family.Libby Hartenburg looks forward to getting to know her students and having an amazing school year.
Jillian Eskenas, Sped Resource Teacher
Email: [email protected]
Jillian Eskenas is a Sped resource teacher at Randolph. She started teaching at Randolph 12 years ago. She taught 5th and 2nd Grade before moving into her current Sped resource position. Prior to coming to Randolph, she was a first and second grade teacher in Manassas City. Jillian attended college at Loyola University in Baltimore where she studied Psychology. She then attended graduate school at The University of Albany where she studied literacy and education. In her free time, she enjoys baking, doing craft projects, traveling, reading, and watching football. When she’s not doing those things, she likes to spend time with her friends, family, and dog.