Yoh, announced Emmett McGrath re-joined the company as executive VP effective Jan. 9. He reports directly to Yoh President Anthony Bosco. During the late ’80s through the early 2000s, McGrath worked for Yoh in various leadership positions. Prior to re-joining Yoh, he was division president of On Assignment Inc. (NYSE; ASGN), and most recently division president and executive VP of Specialist Staffing Solutions Inc., the US division of SThree PLC. Yoh is a business unit of Day & Zimmerman and ranks No. 26 on Staffing Industry Analysts’ list of largest staffing firms in the US.

Professional employer organization Oasis Outsourcing, one of the largest PEOs in the US, announced Dolores Calicchio joined the company as executive VP of human resources. Calicchio has more than 15 years of experience in leadership roles across various industries and previously held HR positions at Merck & Company, Johnson & Johnson, Bayada Home Health Care and Carnival Cruise Lines. She will be based in the company’s West Palm Beach, Fla., headquarters.

Advanced Clinical added Steve Matas, senior VP, staffing, to its leadership team, responsible for leading the staffing efforts across the company, inclusive of recruitment, sales and operations. The Deerfield, Ill.-based clinical development organization provides global services, including clinical staffing. Prior to joining Advanced Clinical, Matas served as VP of sales, health and life sciences, IT staffing and solutions at DISYS where he was responsible for the healthcare and life sciences technology practice.

Executive search firm Korn Ferry International Inc. (NYSE: KFY) announced Mariano Malvicino joined the firm as senior client partner in the global industrial practice. Malvicino most recently worked at a global recruiting firm with organizations across the industrial/natural resources sector, and he previously worked with McKinsey & Company. He will be based in the Houston office.

Executive search firm ZRG Partners Inc. hired David Sheahan as managing director, based in the firm’s Dallas office. Sheahan will focus on the life sciences, technology and energy sectors. He previously was a managing principal at Korn Ferry International Inc. (NYSE: KFY).

The Caldwell Partners (TSX: CWL.TO), a Toronto-based executive search firm with operations in Canada, the US and Europe, appointed Nashville, Tenn.-based partner John Blank as co-leader of the firm's life sciences and healthcare practice, joining Darin DeWitt at the helm of the practice. Prior to joining Caldwell Partners, Blank held positions of increasing responsibility at several boutique executive search firms, including running the healthcare practice at DHR International.

Hire an Esquire, a legal staffing technology company, announced Hi Leva joined its board of directors. Leva recently was VP of sales, marketing, business development and technology at Propel Financial Services, a financial services and fintech firm. He previously was senior VP of sales, sales Operations and PMO at advertising and media firm Clear Channel Outdoor.