San Francisco: Financial District

505 Montgomery Street, Suite 1275
NMLS #1194365 and NMLS #1194437
San Francisco, CA 94111
Main: 415.441.5050 | Fax: 415.441.5047

Marisa Ongbhaibulya

Marisa is a San Francisco native, currently living on the Peninsula. She has over 18 years of experience in lending and has helped thousands of clients achieve their mortgage goals. Whether buying or purchasing, every client is treated as if Marisa was aiding her own family! Marisa is known for strategizing with clients how to achieve their mortgage goals and how to assist them with their future portfolio needs. Mortgage lending transactions can be very stressful, whether purchasing or refinancing — she will get you to the finish line.


Equal Housing Opportunity

Patrick Gardner

In a modern world that seems mainly transactional, the most important thing I can foster is trusted relationships. My passion is transforming lives through financing home ownership and prudent investment in real estate. Being trusted with someone’s largest purchase or financing their commercial investment is the highest compliment I can receive from my referral partners, clients and friends.

As a NorCal Native with more than a dozen years of experience in mortgage finance and real estate I feel well equipped to serve my client’s needs. I have insight into ever changing market dynamics, mortgage products and listen deeply to clients needs, which in a complicated real estate transaction can be the most valuable skill of all.

Accountability and Trust:

People do business with and refer their clients to individuals they trust. Staying on top of loan contingencies, setting proper expectations and meeting close of escrow dates can mean the difference between a happy customer or an irate one. I pride myself on open communication, due diligence and organization. When a client of mine gets their keys and opens the door to their future it completes a transformative process which I am honored to play a part in.

Residential and Commercial Financing:

In my career I have had the privilege of selling and financing a wide variety of condominium projects, single family homes and multi-family dwellings throughout the bay area. This breadth of experience has allowed me to work on a variety projects including small apartment conversions – built by Bay Area families – all the way to residential towers that make up the San Francisco and Oakland skylines. The nuances and hurdles of residential and commercial mortgage finance are significant, but with the proper planning and know how it [...]

Audrey Boissonou

NMLS #254351 | CAL-DRE #01268758
Loan Officer
Licensed in California

Audrey Boissonou, Sales Leader of our Guarantee Mortgage Walnut Creek location is a 30 year veteran in the mortgage industry.  Audrey is passionately driven to ensure every client  will achieve the American Dream of being a homeowner. She is ALWAYS advocating for consumers and has a vast array of industry experience at both the State and National level.  This includes being President Elect for the California Association of Mortgage Professionals (CAMP), and leadership  in many other industry associations. She also has great connections with Realtors in the area to partner with.  Let Audrey help you have a smooth transaction with your home purchase. or refinance.   She knows how to get it done!


APM CA-DRE #01215943
Equal Housing Opportunity

Annie Au-Yeung

Annie has been in the mortgage industry since 2005.  She has helped hundreds of families to achieve their American Dream and enjoy the home ownership experience.  She always treats her clients like her family and friends.  She is very knowledgeable with plenty of patient to guide you through the whole loan process.  Whether you are a first-time home buyer or a savvy buyer, she is here to help.

Annie now lives in South San Francisco, California and has lived in Hong Kong when she was young.  She speaks both Mandarin and Cantonese.

Equal Housing Opportunity

Pov Oum

Pov has been in the mortgage industry for 15 years. In her early career, Pov managed the housing division for a HUD-Approved non-profit housing agency in San Francisco. She managed their housing programs that included First Time Homebuyer Education, Foreclosure Intervention and Counseling, and helped design and successfully ran the REO Acquisition and Rehab program for low-to-moderate income buyers.
Whether you have owned homes before or you’re entering the housing market for the first time, the home buying process can be one of the most stressful and biggest financial decisions of your life. Pov offers all her clients a detail consultation about everything you should know before starting the process. She walks through the home buying process from beginning to close of escrow with her clients to ensure a smooth and stress-free transaction.
Pov’s passion for helping others, her keen knowledge of the industry and her knack for empathizing and building great relationships is a driving force for her success in the business.


Equal Housing Opportunity

Mark Wiener

Equal Housing Opportunity

Christopher Anthony Tyeskey

Chris Tyeskey has been a distinguished senior financial services executive for over two decades. An award winning individual producer and managerial leader of several vice presidency roles with Wells Fargo, Citibank, Union Bank and United American Bank. This has given him a unique customer focused perspective on the importance of delivering exemplary service.

Chris was blessed to be born and raised in his beloved San Francisco where he lives with his wife and business partner, Cecelia Tyeskey. Cecelia has been one of Guarantee Mortgage’s successful licensed mortgage advisors since her start in 1999. She currently serves as Guarantee Mortgage’s designated Reverse Mortgage Specialist. Their combined talents of over 50 years of lending experience helps set them apart from other lending providers.

Chris welcomes the opportunity to demonstrate the care of a consummate professional. He is dedicated to delivering a clear and comprehensive understanding of the lending process always rooted in the philosophy of absolute integrity.

Equal Housing Opportunity


Joel Marks

Joel, a Bay Area native, has had an extensive career both inside and outside the mortgage world.

After graduating with a double major from UC Berkeley, Joel moved to Washington, D.C., where he worked on a variety of Congressional, Senate and Presidential campaigns before founding a national small business advocacy organization.  In this role, he mobilized business owners from around the country, helped enact legislation at the state and federal level and was a recognized leader on business issues.  He has been interviewed by dozens of publications including The Wall Street Journal, Washington Post and Business Week and was profiled in Entrepreneur Magazine.

Following his 15-year career in politics, Joel was recruited into the mortgage industry at Washington Mutual.  While there, Joel was well-known for his innovative marketing campaigns that led to hundreds of millions of dollars of broker loan originations and earned him a spot in WaMu’s distinguished President’s Club.

Joel switched to the consumer side of the business upon receiving his state license in 2008 and has been a top performer ever since.

Joel is married to a childhood friend, Jennifer, who is a local Realtor in Marin.  Jennifer and Joel have three children and are very active in their community, volunteering at the schools, cooking and delivering meals to neighbors with newborns or sick family members and supporting their kids’ various sports teams.


Equal Housing Opportunity


Risa Joy Meyer

Risa Meyer has been in the mortgage business since 1984, always proud to be affiliated with organizations that reflected the same high standards she prides herself on: Commitment, Ethics and Service. First she was with Citibank, and then she moved to First Security Loan Corp in 1991 as a State Licensed Mortgage Originator.   She tells us, “I was immensely proud to be affiliated with two of the top mortgage lenders in the Bay Area,. And now I’m thrilled to be able to continue my career with Guarantee Mortgage,”

Risa is a professional, detail oriented, creative problem solver. She becomes her clients’ advocate, and the liaison between them and the other service providers who may be part of the transaction. She makes herself available to answer her clients’ questions, and keeps them informed each step of the way.

“I want to get to know my clients, and what is important to them.   I sincerely care about their interests and strive to package a loan that will satisfy both their personal and financial objectives with competitive options.”

As part of Risa’s commitment to service, she is a volunteer mediator with Community Boards, a San Francisco organization dedicated to empowering residents with the skills and resources needed to help resolve conflict. She is also a long term Board member with her Ski Club. In her free time you can find her enjoying the moment with friends, usually followed by a good meal!  Loves to play tennis and golf.

Risa is licensed with the DRE and NMLS, and is a member of SFBOR, CAMB, and NAMB.

APM CA-DRE #01215943
Equal Housing Opportunity

Bob Siefert

My goals as a Senior VP here at Guarantee Mortgage:
**For Realtors**
My Goal is to make sure all Guarantee Mortgage Loan Officers will be TEAMMATES in building your business. This means providing ideas to help you grow your business, ensuring every client referral is thankful you sent them to Guarantee Mortgage and that we close your purchase or refinance referrals on time. Ask us about our “KEYS ON TIME” and “SECURE LOCK” programs.
**For Loan Officers**
My passion is working with producing Loan Officers that are looking to improve their level of service to their clients with a strong platform of success, competitive rates, a multitude of loan programs and successful service oriented support staff. My focus is on your success and helping you shape a plan for action with marketing resources including:
+ Banking & Wholesale Platforms
+ Competitive Jumbo & Agency Mortgage Products
+ Unmatched Pricing with a Competitive Compensation Model
+ Loan Scenario Assistance
+ Delegated Underwriting
+ In-House Support Staff
+ Commercial Financing
+ Bridge Loans and more….
Let Guarantee Mortgage help take you to the next step in your career.
**About Me***
I joined the Guarantee Mortgage Family in 1991 and assisted in growing the company to a successful and respected mortgage company in Northern California funding over 2 Billion in Loans annually with thousands of happy clients. In 2014, Guarantee Mortgage  joined forces with American Pacific Mortgage Corporation.  APMC with $8.1 Billion in loan production was ranked as one of the top 15 Mortgage Companies in America (by Mortgage Executive Magazine). In joining forces with APMC, Guarantee Mortgage becomes an even bigger player in the SF Bay Area real estate market.

APM CA-DRE #01215943
Equal Housing Opportunity

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