Active Email List of US Businesses

I'm looking for a verified email list of medium-sized (51-200 employees) businesses in the USA. The list should be composed solely of business owners and directors.

Criteria:
- Company Size: Medium-big (50+ employees)
-Industry: All except Healthcare
- Location: USA
- Target: Business owners or directors
- Activity: Email list should be active and verified within the last month

Ideal Skills and Experience:
- Proven track record in lead generation
- Expertise in data verification and email list creation
- Understanding of targeting specific business demographics
- Experience with medium-sized US businesses preferred