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Senior Leadership Team

Bullis School Senior Leadership Team (SLT) provides ongoing evaluations of the school’s educational programs and their impact on student experience and achievement. Together with the Head of School, the team makes collaborative decisions that positively impact the entire school community.

Christian Sullivan

Head of School

Christian Sullivan began his tenure as head of Bullis School on July 1, 2020. A native of England, Mr. Sullivan holds a bachelor’s degree in education from the University of Durham, a master’s degree in educational management from the University of Bath, and a master’s degree in independent school leadership from Columbia University.

During his career, Mr. Sullivan has served as an administrator and teacher at independent schools in England, Kenya, Virginia, Connecticut, and Washington State. Bullis is his third headship, following ten years as head of Annie Wright Schools in Tacoma, WA. An active community leader, Mr. Sullivan has served on the boards of the Northwest Association of Independent Schools, the Washington Federation of Independent Schools, St. Paul’s School, WA, and Tacoma’s Museum of Glass. → Learn more about Mr. Sullivan

Margaret Andreadis

Head of Lower School

Margaret Andreadis has been a member of the Bullis Lower School team since 2011. She serves as Head of Lower School and helped to provide a joyful, safe, and challenging in-person Lower School experience during the pandemic. Margaret earned a Master of Arts in Teaching from Johns Hopkins University, a Master in Industrial/Organizational Psychology from George Mason University, and a Bachelor of Science in Psychology from James Madison University. Margaret is grateful to be a mother to three amazing young adults and is also a Bullis parent. Her hobbies include family first, skiing, cooking, and walking/hiking with her husband and their puppy, Kallie. Margaret chooses joy whenever possible.


Faith Darling

Dean of Faculty, Math Teacher, Upper School

Faith Darling joined the Bullis faculty in 2006 as an Upper School math teacher. During her time at Bullis, she has served as Chair of the Math Department and helped to launch the STEM Signature Program in 2013 in the role of STEM Director. In 2019, Faith moved to her current position as Dean of Faculty, which supports the growth and development of her outstanding Bullis colleagues, and she continues to find joy in the math classroom. She is a proud wife and mother to three daughters and is a Bullis parent. She and her family enjoy camping, being outdoors or embarking on new crafting and home projects.

Jamie Dickie

Executive Director of Technology

Jamie Dickie joined the Bullis faculty in 1998 teaching math in Upper and Middle School. He currently serves as the Director of Technology, overseeing the integration of educational technology into the curriculum as well as the technology infrastructure of the school. During his tenure, Jamie has served as Upper School Mathematics department chair, Technology and Engineering department chair, Co-Chair for the Bullis Accreditation Steering committee, and is a member of various AIMS accreditation visiting teams. He has been a speaker at the Future for Educational Technology Conference and the iNACOL online and blended learning conference. Jamie earned a Bachelor of Arts in History and a Master of Science in Mathematics from Michigan State University.

Ryann Fapohunda

Director of Teaching and Learning K-12

Ryann Fapohunda started at Bullis in 2021 and is the Director of Teaching and Learning. Prior to Bullis, Ryann served as the Co-Director of the Teaching and Learning Center and Assistant Dean of Upper School at The National Cathedral School. Ryann holds degrees from the University of Pennsylvania, Dayton, and Antioch and has shared her educational expertise as a board member of several community programs such as ConnectDMV and College Girl Inc. Ryann brings a deep knowledge of teaching and learning, a love of collegiality, and a commitment to student-centeredness. Ryann enjoys spending time in nature, hiking, or exploring with her husband, son, and French bulldog.

Sharon Kessler

Director of Advancement & External Affairs

Sharon Kessler has been in the office of Advancement at Bullis School since 2017. She has been a Fundraiser for over 18 years, beginning her career in NYC as the Chief Development Officer at Big Brothers Big Sisters of NYC. Ten years ago, Sharon and her husband and two daughters moved to the Maryland/DC area where she served as a fundraising consultant for Children’s National Health Systems. Sharon earned her B.A. in Sociology from The University of Massachusetts. She has been a speaker at Fundraising Day in New York City and at the Bridge Conference for the Association for Not for Profit Professionals. Sharon is also married to a Bullis Alum, Leigh Kessler ’93, and a Bullis parent.

Dr. Marilyn Moreno Ph.D.

Head of Middle School

Dr. Marilyn Moreno has been a member of the Bullis faculty since 2012. Having worked as an executive leader in education for many years, she brings a wealth of experience, knowledge, and expertise to her position as Head of Middle School. She earned her undergraduate degree from Ohio University, a Master's in Curriculum and Instruction from Cleveland State University, and a Doctorate in Education Administration from Ohio University. Former leadership roles include serving as a principal, curriculum supervisor, regional director, and assistant superintendent.

Marilyn has served as an adjunct professor for Bowie State University and a traveling professor in Athens, Greece. Committed to mentoring and developing teachers as instructional leaders, she currently works as a college supervisor for interns seeking Master's degrees in Educational Administration from McDaniel College. She is certified by the National Institute of School Leadership and by the Framework for Teaching organization.

Dedicated to providing a rigorous student-centered instructional program to the Middle School division, she enjoys reading, spending time with family, and traveling. One of her daughters, Ariana, is a proud Bullis Alumni (Class of 2015) and an Admissions Associate for the school.

Robert "Bobby" Pollicino

Head of Upper School

Bobby Pollicino has been a member of the Bullis faculty since 2003. He currently serves as the Head of Upper School and is a Bullis parent. He earned his Master of Education from William & Mary and a Bachelor of Science in Biology from Washington College. Bobby is a speaker and presenter for the Association of Independent Maryland & DC Schools (AIMS), International Society for Technology in Education (ISTE), and Building Learning Communities (BLC) and is a contributor to National Association for Independent Schools (NAIS) Publications. He also enjoys reading, writing, and Brazilian Jiu-Jitsu.

Tim Simpson

Associate Head of School

Tim has been a member of the Bullis faculty since 1997 and is currently the Associate Head of School. He has also served as Middle School and Upper School Science teacher, Admission Associate, 9th/10th grade Principal, Upper School Assistant Principal, Director of Admission and Financial Aid, Assistant Head of School, Varsity Hockey and Lacrosse Coach, and Advisor. Tim has a bachelor's degree from Tufts University and a master's degree from Johns Hopkins University. His three children Meghan '21, Will '24, and Tommy '29 are all proud Bullis students. His wife, Laura, is a former Bullis teacher and coach and is involved with the Parents Association.

Matt Trammell Ed.D.

Director of Admission

Matt has been a member of the Bullis faculty since 2014. He currently serves as Director of Admission, having previously served a Middle School teacher and Assistant Head of Middle School. He earned degrees in communications, education, and educational leadership, including his Doctorate of Educational Leadership from Carson-Newman University. Matt is the co-author of the book School Culture Fit: How to Align Students, Parents, and Faculty Under One Common Purpose and co-hosts the Elevate School Leadership Podcast. He is also an avid reader and an aspiring foodie. Most of all, he enjoys finding new weekend adventures with his family. 

Rachel Venezian

Director of Finance and Operations

Rachel Venezian has enjoyed working in educational nonprofits for over twenty years. Prior to arriving at Bullis in 2020, Rachel worked for 11 years as the Director of Finance for the College of Professional Studies and the Virginia Science and Technology Campus at George Washington University (GW) and three years as a Senior Budget Analyst in GW’s University Budget Office. She also served as Director of Budgeting and Auxiliary Services at the Corcoran Gallery of Art where she oversaw the museum cafe and admissions desk in addition to being responsible for budget preparation and forecasting. 

Rachel is a former Peace Corps Volunteer, having served as a math and science teacher in a public high school in Tougan, Burkina Faso. During her Peace Corps service, she participated in the WHO campaign to eradicate polio from Burkina Faso.

Meredith Wade

Executive Assistant to Head of School

Meredith Wade joins the Bullis community most recently from serving as a consultant with the Hope For Henry Foundation, a non-profit focused on improving the hospital experience for seriously ill children and their families. Formerly, she was an adjunct professor at George Washington University and an attorney. Meredith has degrees from Colgate and Harvard Law School. In her role at Bullis, Meredith provides support to the Board, the Senior Leadership Team, and the Head of School. Meredith is obsessive about the New York Times crossword puzzle and has done it every single day for years. She is an avid podcast listener, loves to travel, and spending time with her husband and three children.