1. INTRODUCTION
1.1. The TESS-Keck Survey: Planet atmospheres

2. TESS PHOTOMETRY

3. HIGH RESOLUTION IMAGING
3.1. Literature Observations
3.2. Palomar-PHARO and Keck-NIRC2 observations
3.3. Palomar-PHARO and Keck-NIRC2 reduction
3.4. TIC 600433892: a stellar companion to HD 6061

4. DETERMINATION OF STELLAR PROPERTIES
4.1. Stellar template observations
4.2. Stellar characterization

5. DOPPLER FOLLOW-UP
5.1. Keck-HIRES
5.2. APF-Levy

6. LIGHT CURVE INSPECTION AND CLEANING
6.1. Transit search
6.2. Light curve cleaning and initial transit fitting
6.3. Search for transit timing variations

7. SEARCH FOR RV TRENDS AND NON TRANSITING COMPANIONS
7.1. RV trends
7.2. Non transiting companions

8. STELLAR ACTIVITY CONSIDERATIONS
8.1. Correlated $S_{HK}$ values and RV residuals?
8.2. Periodogram analysis
8.3. The case of HD 6061

9. JOINT PHOTOMETRY, RADIAL VELOCITY, AND ACTIVITY MODELING
9.1. Transits
9.2. Radial velocities
9.3. Gaussian process modeling of stellar activity
9.4. Posterior estimation

10. JOINT MODELING RESULTS
10.1. HIP 8152 (TOI-266)
10.2. HD 42813 (TOI-469)
10.3. HD 25463 (TOI-554)
10.4. TOI-669
10.5. HD 135694 (TOI-1247)
10.6. HIP 9618 (TOI-1471)
10.7. HD 6061 (TOI-1473)
10.8. TOI-1736

11. RV MODELING WITH RadVel
11.1. Keplerian-only modeling
11.2. Gaussian process modeling

12. PLANET BULK COMPOSITION
12.1. The mass-radius diagram
12.2. smint analysis

13. PROSPECTS FOR ATMOSPHERIC CHARACTERIZATION

14. CONCLUSION