# Dr. Julian Sass – Cal.com booking page

> Dr. Julian Sass specializes in cosmetics R&D, focusing on clinical testing and formulation. He has worked and consulted for beauty companies of all sizes in R&D, education, and product development, carried in retailers around the world. Known for effectively communicating complex scientific concepts about skin, hair, and OTC products, Dr. Sass also maintains a sunscreen database with 500+ products and has been featured in The Washington Post, Vogue, Business of Fashion, and Today.

Booking page: https://cal.com/drjuliansass

## Event types

- [New Consulting Client Consultation](https://cal.com/drjuliansass/new-consulting-client-consultation): 60 min, requires the host’s confirmation, paid, event type id 2929679. This Private Project Consultation is for those seeking to hire me as a consultant. During our call, we'll explore your product development and R&D needs. Please be ready to discuss your brand concept, relevant deadlines, and collaboration expectations. I look forward to learning about your project and how I can help your business grow. Details: https://cal.com/drjuliansass/new-consulting-client-consultation.md
- [New Formulation Client Consultation](https://cal.com/drjuliansass/new-client-consultation): 60 min, requires the host’s confirmation, paid, event type id 2552072. This Private Project Consultation is for those seeking to hire me as their Cosmetic Chemist. During our call, we'll explore your custom formulation and product development needs. Please be ready to discuss your formula or concept, deadlines, and collaboration expectations. I look forward to learning about your project and how I can help launch your new product. Note that the booking fee will count towards a deposit for any future formulation services booked. Details: https://cal.com/drjuliansass/new-client-consultation.md

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction