Scientist, Embryology/Theriogenologist

Colossal is looking for a strong researcher who will spearhead groundbreaking research on techniques for oocyte collections and embryo transfers in non-model organisms, as well as the in vitro production of gene-edited embryos. 

This role works with talented reproductive biologists to continue to develop, implement, and maintain strategic plans of the embryology department. This position reports to the Director of Assisted Reproduction.

**This position is based out of Dallas, TX and relocation assistance is provided.**

Duties and Responsibilities:

• Develop protocols for transvaginal, transrectal, or laparoscopic oocyte collection in a variety of novel, model species. 

• Optimize estrus synchronization and superovulation protocols for species in which frequent handling is difficult.

• Collaborate with the embryology team to optimize conditions for oocyte and embryo transport between animal facilities and laboratories at Colossal HQ.

• Stay up to date on relevant literature, identify novel protocols/procedures that may be applicable for Colossal projects, and conduct associated experiments to continuously improve results.

• Maintain stable rates of success and troubleshoot protocols as needed. 

• Some traveling required for training and implementing novel assisted reproductive technologies into non-model organisms

Required Skills and Abilities:

• Strong expertise in comparative reproductive biology, including endocrinology, oocyte maturation, and pre-implantation embryo development.

• Experience with multiple species, including non-traditional (wildlife) models preferred.

• Transrectal palpation and ultrasound for monitoring ovarian activity and early pregnancy.

• Transvaginal and/or laparoscopic oocyte collections.  

• Gamete and embryo cryopreservation.

• Strong communication skills (written/verbal)

• Ability to work independently, with members of the Animal Operations and Embryology teams, including veterinarians, scientists, and animal husbandry experts.

• At least three years of experience with oocyte collection, embryo collection/production, and embryo transfer with a track record of successful pregnancies.

• Must be able to travel, potentially up to 25%

Education and Experience:

• D.V.M. and/or Ph.D. in biological sciences, veterinary medicine, or a related field.

• Two years of post-doctoral experience or residency training.

• Demonstrated track-record of publication in peer-reviewed journals.

What Colossal Offers Full-Time Employees:

• Medical, dental, and vision coverage

• Excellent paid time off and company holidays so you can rest and recharge 

• Flexible spending accounts (FSA)

• Company matched 401k retirement plan

• Paid parental leave at 100% salary for up to 12 weeks

• Education reimbursement 

• An opportunity to help us return the Earth to a healthier state

The team at Colossal is committed, colorful, passionate, intelligent, collaborative, creative, experienced, scientific and world-class. That sounds like a lot to fit into one building. That’s why we are spread out in several locations that include laboratories, test facilities, academic institutions, libraries and offices. 

Through it all, however, we maintain a culture of positivity, hope, happiness and belief that we’re doing something big. Something Colossal.

Colossal is proud to be an equal employment opportunity workplace. We welcome people from all backgrounds as well as celebrate and support diversity. We are committed to providing an inclusive environment of mutual respect that is free from discrimination and harassment so everyone can thrive.  

EEO is the Law 

Search Firm Representatives: Colossal does not accept unsolicited assistance from search firms. No fees will be paid for a hired candidate where no pre-existing agreement is in place. We handle most recruitment in-house. 

Colossal is on LinkedIn's 2026 Top Startups in Dallas List! See the list here.

Colossal is on Fortune's 2026 List for Best Workplaces in BioPharma. See the list here . 

Colossal is proud to be named a Best Place to Work by BuiltIn for 4 years in a row across multiple categories in 2023, 2024, 2025, and 2026:

• #1 on the 50 Best Startups to Work For in Dallas in 2023!

• 100 Best Midsize Places to Work in Dallas in 2024 & 2025

• 100 Best Places to Work in Dallas, TX (All Size Employers) in 2024, 2025, and 2026.

Built In 2026 Award Lists

Great Place to Work Certification Page

Most Loved Workplace Certification Page - Proud to be certified as a most loved workplace including: most loved CEO, most loved workplaces for LGBTQ+, most loved workplaces for women, and most loved workplaces for young professionals.

Newsweek's Most Loved Workplaces 2024 Award List - Excited to be amongst the winners of Newsweek's 2024 Most Loved Workplaces!