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Contact Us

International House at the University of California Berkeley
2299 Piedmont Avenue
Berkeley, California, 94720-2320 USA
General Information/Front Desk: (510) 642-9490

For help with a specific question, please contact one of the following departments directly:

Admissions/Housing Admits students and assigns rooms. (510) 642-9470 ihres@berkeley.edu
Catering Services Provides in-house and off-site catering services. (510) 642-6794 ihcatering@berkeley.edu
Center for Intercultural Leadership Cross-cultural education/training. (510) 643-3124 cil@berkeley.edu
Development & Alumni Relations Alumni activities & fundraising. (510) 642-4128 ihalumni@berkeley.edu
Dining Services Meal service for residents and the public. (510) 643-3266 ihdining@berkeley.edu
Events and Rentals Event facilities and guest suite rentals. (510) 642-3438 ihevents@berkeley.edu
HR / Jobs at I-House Human Resources and staffing. (510) 643-5308 tascott@berkeley.edu
Program Office Organizes House and resident-initiated programs. (510) 642-9460 ihprograms@berkeley.edu
Resident Support Services:Safety,mediation,special accommodations.
(510) 642-9480 chabe@berkeley.edu

To contact an I-House staff member, see I-House Staff Directory (pdf).

Senior Staff Bios

Executive Office

Hans Giesecke
  • Hans C. Giesecke, Ph.D. Executive Director
    (510) 642-9468
    • Hans Giesecke began his service as Executive Director/CEO of International House at UC-Berkeley in July 2012. His driving focus has been on making I-House students' residential experience a top highlight of their enrollment experience at Berkeley. Prior to his arrival at Cal, Hans served as President of Anatolia College in Thessaloniki, Greece where he led an "American-style" international campus with more than 2,300 pupils and students from Kindergarten through MBA.

      Before serving in Greece, he was President/CEO of the Independent Colleges of Indiana, Inc. in Indianapolis, the President's Advisor for Student Affairs at International University Bremen in Germany (now Jacobs University), President of the Tennessee Independent Colleges and Universities Association (TICUA) in Nashville, TN, and Director of Marketing and Research with the Association of Independent California Colleges and Universities (AICCU) in Sacramento. He earned his Ph.D. from Vanderbilt University in Education and Human Development. His M.A. was received from the University of Wisconsin-Madison and his B.A. from Williams College.

      Hans enjoys many opportunities to interact with current I-House residents and the thousands of Cal alumni around the world who recall their I-House residency as one of their fondest, university-related personal memories.

Bonnie Johnston
  • Bonnie Johnston Executive Assistant to the International House Executive Director
    (510) 642-2196
    • Bonnie Johnston has worked in a variety of administrative capacities in the non-profit sector for over 25 years.

      She joined International House in July 2013, having previously worked at several nearby institutions. Bonnie and her family have resided in Berkeley since 1991. She most recently was Executive Administrator to the Office of the President at San Francisco Theological Seminary in Marin County for nearly four years, managing the office, supporting the president, planning events, staffing two Board committees and serving as the primary liaison to the 36-member Board of Trustees.

      Previously, Bonnie worked as assistant to the president, development associate, designer and volunteer coordinator at New College for Advanced Christian Studies in Berkeley. After the institution changed direction and reduced in size, she worked for 16 years at one of the Affiliate Centers of the Graduate Theological Union, the Center for Theology and the Natural Sciences (CTNS) in progressively responsible roles. As Administrative and Communications Director at CTNS, she oversaw development, membership, finances and corporate work of the center, enlarged and expanded the communications and public relations work and supported the Board of Directors. She refers to herself as a "Jane of all trades."

      Bonnie is pleased to be working at International House to help advance its mission of peace, harmony, tolerance, and mutual respect. She looks forward to engaging with the Board of Directors, staff, volunteers and residents, and partnering with various university departments on the Gateway Fellowship Program and other initiatives managed by the Executive Office.

I-House Operations and Center for Intercultural Leadership

Bonnie Johnston
  • Jason Patent Director of the Center for Intercultural Leadership and I-House Chief of Operations
    (510) 643-6625
    • As the Director of the Center for Intercultural Leadership (CIL), Jason Patent is responsible for building I-House's existing training programs and expanding them to meet the needs of increasing numbers of I-House residents, UC Berkeley campus units, and external businesses and non-profit organizations.
      As the Chief of I-House Operations, Jason works closely with other directors and top managers to ensure that the programs and services I-House offers continue to develop in ways that meet residents’ needs and interests in the following areas:

        •  Resident Intake (Admissions)
        •  Financial Aid and Scholarships
        •  Resident Support Services
        •  Activities, Conferences, and Programs
        •  Events and Facilities Rentals
        •  Physical Operations – including Maintenance and Custodial Services
        •  Human Resources and Personnel

      Jason has an undergraduate degree in East Asian Studies from Harvard, a Master’s degree in the same field from Stanford University, and he completed an M.A. and a Ph.D. in Linguistics at UC Berkeley. Jason is known for his ability to teach and to find practical uses for theoretical concepts. He is committed to using his skills and experiences to foster understanding and successful collaboration among international populations. His previous professional roles include: American Co-Director of the Hopkins–Nanjing Center for Chinese and American Studies in Nanjing, China; Inaugural Director, Beijing Center, Stanford Bing Overseas Studies Program; Consultant at Gap International; Vice President, Communications & Marketing at Orchestrall, Inc.



Admits students and assigns rooms.

Ryan Jones
  • Ryan Jones Director of Admissions
    (510) 642-9471
    • Ryan Jones joined the International House team in 2010 as the Director of Admissions. In this capacity, he oversees all aspects of housing administration and residential life and services. This includes marketing and outreach, application review and management, and room assignments, as well as supervising the Residential Manager and Front Desk operations.

      Ryan has more than 15 years of professional experience in the field of higher education administration and student affairs. During his career, Ryan has worked in a number of areas including new student orientation, academic advising, student activities, residential life and judicial affairs. He served as a live-in housing professional for ten years before advancing to the role of Assoc. Dean of Students at the California College of the Arts where he was in charge of campus housing, judicial affairs and student activities. Throughout his career, Ryan has worked with select student populations with a focus on diversity education. As part of his master's degree program, he completed a minor in diversity education and has broad experience as an intercultural trainer.
    • Kimi Mojica earned her Master of Arts Degree at the University of Oregon School of Law in Conflict and Dispute Resolution and Bachelor of Arts in American Studies from U.C. Santa Cruz.
      In her new role at I-House, Kimi will be helping to lead I-House forward in creating programming for our residents that is innovative and deeply meaningful. We are thrilled to have her join the I-House family.


Development & Communications

Alumni relations, fundraising and communications.

Joy Iwasa
  • Joy IwasaDirector of Development & Communications
    (510) 643-6916

Resident Support Services (RSS)

Responsible for residential life, safety & security, student conduct, and housing accommodations.

Maribel Guillermo
  • Maribel Guillermo Manager of Resident
    Support Services
    (510) 642-9480
    • Maribel Guillermo joined I-House in 1997, initially working in different capacities for the Admissions Office and the Program Office. She has been the Manager of Resident Support Services since 2001. In this capacity she oversees residential life, including the safety and security of residents, student conduct, special housing accommodations, and assists residents with conflict mediation. Maribel also supervises the 15 Resident Assistants who monitor the well-being of the residents both during the academic year and summer and is responsible for the recruiting, hiring, and training of her student staff. Maribel graduated from UC Berkeley with a B.A. in Sociology and holds a certificate in 'Multicultural Conflict Mediation and Resolution'. Her professional career began as an elementary school teacher in her native Mexico. Maribel also worked as project manager for the international division of Berkeley-based World Institute on Disability.

  • Administrative Services and Human Resources

    Deborah Preston
    • Deborah PrestonDirector of Administrative Services
      (510) 643-5308
      • Deborah joined I-House in March 2014 as the Human Resources/ Labor and Employee Relations Manager. Deborah has a wide-ranging background in the human resources field, having worked in several related capacities over the last 25 years. She is primarily responsible for overall management and guidance of I-House human resource functions, including the recruitment and hiring process for all positions within I-House, resolving complex staff relations matters, evaluating and administering the various policies and procedures, labor relations, payroll, benefits, training and development, as well as formulating strategies and initiatives to enhance the overall I-House experience for our residents and other guests.

        Deborah received her B.S. degree in Business Management from St. Mary’s College in Moraga, California. Her previous professional experience include working as the Assistant Director of Human Resources for Contra Costa County, with an employee population of approximately 9,000 staff members, and a 21-year career at the Port of Oakland where she served as the Human Resources Manager and Labor Relations Supervisor.

    Physical Operations

    Mark Cassettari
    • Mark CassettariDirector of Physical Operations
      (510) 642-7788
      • Mark Cassettari started his career at International House in November 1990 as part of the International House Maintenance staff. He is a second generation Cal Berkeley staff member. Mark was promoted to Assistant Director of Facilities in 2012, and is currently the Interim Director of Facilities. Mark enjoys playing the ukulele and riding his motorcycle.


    • Bill Gong Director of Business and Finance
      (510) 643-8315