Our Core Team

Vivien Liu


Vivien is the heartbeat of the company. Coming from a luxury brand management background with Harrods, Prada and LVMH, Vivien brings in the highest level of customer service and brand experience to all her endeavors. Having to sacrifice her decade-long promising career to fulfill parenthood dreams lent her the hard-won joy as a mother. It also fostered her compassion towards others who are fighting to build their own families. Vivien formed Giving Tree on the belief that planned parenthood is a journey where selfless people work together to make miracles happen and care must run through it consistently before, during and after any surrogacy pregnancies.

"I love working in the surrogacy and egg donation industry, because it is a battlefield where vision, execution and ethical standards are demanded and challenged to its core. It is also a cradle where life and hope are created with care, perseverance, and love. What more do you want?"

Marissa Wanigatunga

Client Relations Manager

Marissa has been in the fertility industry for about 13 years. She initially developed a curiosity for third party reproduction while she was in graduate school and had a supervisor who had twins through egg donation. She thought it was a profound gift that she could carry the pregnancy of her twins and breastfeed her babies without being genetically related to them. She felt drawn to be a part of these incredible journeys that families participate in to have their children.

She has developed and grown over the years to be understanding and insightful with clients from a systemic perspective. The emotions involved in fertility journeys are complex, so she prioritizes supporting her clients and being alongside them every step of the way to reach their family building goals.

"I am truly passionate about sharing my knowledge and experience in the fertility industry with others. It is a joy and an honor to be a part of the family building process with our clients. As a parent of two beautiful children, it is a privilege to share the utter joy of parenthood with our clients.”

Rebecca Cole

Match Specialist

Rebecca is new to working in the surrogacy world but has had an interest in it for many years. Her experience has been in family support systems, and she found great joy in making sure children and families had what they needed. The empathy and understanding she brings from her time serving families in their toughest moments allows her to connect with surrogates and intended parents in a meaningful way. Her years of interest in family development has made it feel like a long time coming for her to be able to help families navigate surrogacy and growing their families. She is eager to support intended parents and surrogates through this life changing journey.

"It's a true honor to bear witness to selflessness, love, and perseverance from many different people all coming together to grow a family. I am grateful to play a role in this experience for our families.”

Hannah Ge

International Outreach Associate

Hannah has been helping IPs match with surrogates for six years, since 2016. During the first year when she started in the industry, she worked with one of her close friends who could not have children independently. They did IVF several times and two years later, they had their beautiful daughter. After that, Hannah started to think about helping other families. Since beginning her work with surrogacy, she has had the privilege of seeing several babies come into this beautiful world and the parent's happy faces.

"I know this is a terrific and meaningful job for me. I am looking forward to helping your family in the future.”

Sahara Spenkoch

Surrogate Intake Manager

Sahara recently joined Giving Tree Surrogacy with more than 5 years prior experience working directly with surrogates. With a background in marketing and sales, she stumbled into the industry by accident but quickly fell in love with it. She has a profound admiration for the surrogates and what they are doing. She cherishes the bond she builds with each one of the surrogates she has the opportunity to work with. Her experience allows her to seamlessly walk potential surrogate candidates through the entire process, enabling surrogates to feel supported and well informed.

Sahara lives in Round Rock, Texas, and when she is not working, you can find her spending time with her son and daughter, running or kickboxing.

"The relationships I have the privilege of building with the surrogates is why I love what I do, getting to talk to the girls and be there for them while they are on this amazing journey."

Caroline Gerber

Surrogate Consultant

Caroline is relatively new to the surrogacy world but her career's focus has always been serving children and families. As a child protection worker, she found great passion in her work, ensuring children were safe from abuse and neglect. She held the title of Miss Wyoming USA in 2015 and used the national Miss USA stage to advocate for the great need in the foster care community. After working in a non-profit for the last few years, she is excited to focus her work back on the family unit and is thrilled to be able to help build families.

"It is an honor and great privilege to be a part, however small, of this journey with these women. Their willingness to give of themselves and help complete families is worthy of admiration."

Kelly Van

Surrogate Consultant

Having several years experience providing support to surrogates, Kelly Van recently joined Giving Tree Surrogacy.

Her background in human resources, recruiting, diversity and inclusion, consulting, business management and ownership provides a basis for delivering services, programs and experiences with excellence and empathy. Most importantly, she is a mother to her son, who is a source of inspiration and motivation.

Kelly enjoys traveling, food, music, fitness, hiking, being outdoors and spending time with her family, including two little dogs.

"I am deeply moved by the stories of our wonderful surrogates and the intended parents who long to have a family. As a member of Giving Tree Surrogacy, I am honored to provide support to our surrogates and to play a small part in enabling families to grow. My goal is to provide excellent service and clear communication. Ultimately, I hope that our surrogates will be thrilled that they embarked on the surrogacy journey."

Tonia Rivera

Egg Donor & Surrogate Consultant

Tonia joins our team as an experienced egg donor and gestational surrogate. With a license in Early Childhood Development and having always worked in a service related industry, first as a pre-school teacher then as a wedding and events coordinator, serving people with compassion and empathy is just in her blood, and it shows!

Tonia has always found fulfillment in helping others, and hearing of the very real struggles intended parents face led her to egg donation and surrogacy. Her own journeys instilled a knowledge and awareness that gave her a feeling her work wasn’t complete; compelling her to continue
helping families in their own journeys.

"Giving life, is living life, and I truly believe that I live to serve. There is so much joy in starting and growing your own family, being a surrogate and helping another family grow only adds to that joy and fulfillment, knowing you've done something in life that is bigger than yourself.”

Jack Lee

Program and Office Manager

Jack, our Program and Office Manager, joined Giving Tree Surrogacy & Egg Donation in 2018. He brings with him over 20 years of knowledge ranging from administrative, customer service, and sales. Jack has firsthand experience with IVF clinics and surrogacy agencies as a former prospective intended parent himself. It was this experience that allows him to speak about surrogacy and egg donation from a unique, personal perspective. Jack works closely with IVF clinics, ancillary infertility service providers, intended parents, surrogates, and donors to ensure a smooth journey for everyone.

Jack resides in Orange County, CA and when he isn't working, he spends time with his wife and daughter enjoying all of life’s little moments.

"Having witnessed firsthand, there is no greater joy than combining my experience and passion to helping couples realize their parenthood dreams.”

Jiajia Gao

Case Manager

Jiajia has been in the Surrogacy and IVF industry for 4 years. While working at the practice level at SCRC, she saw many couples struggling to get pregnant as they tried to overcome fertility issues. Seeing their sadness and how eager they were to build a family of their own is what motivated Jiajia to be a part of a team that could make dreams a reality.

Seeing the courage of intended parents along with the warm hearts of surrogates are what made her fall in love with this industry. To Jiajia, it’s the best thing in the world to make someone’s dream come true.

“Every time a baby is born, I see smiles and happy tears on everyone’s faces…these are moments I’ll never forget.”

Tania Calderon

Case Manager

When Tania first heard about surrogacy it was on TV. She never imagined surrogacy could be so close to home. In 2017 a colleague of hers was going through surrogacy. After doing research on surrogacy for almost a whole year, she decided to apply. Tania has completed two surrogacy journeys in 2018 and 2020.

Tonia absolutely loves having a close relationship with the surrogates she works with. She is an experienced surrogate and can relate with our surrogates. She understands what it means for the Intended parents to want a child and wants to be that small impact in their lives.

"Our egg donors, surrogates, and intended parents give me so much joy and knowing that I can make a difference in their lives. It's truly a blessing to be able to work for our clients."

Kearie Allen

Case Manager

Kearie is a wife, mother of 3 adult children and Surro-mom to 6 amazingly beautiful Surro-Babes. Kearie has had 5 very different journeys (2009-2021) including a set of twins that have helped shape the person she is today! As a coordinator, she is able to share her experiences and connect with both IPs and Surrogates. On her down time Kearie enjoys baking, scrapbooking, and playing with their sweet chihuahua.

"As a retired Surrogate, I continue to feel fulfillment by guiding Intended Parents and Surrogates through the rollercoaster of a journey called Surrogacy. I'm so grateful to be a part of helping them through all the ups and downs."

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